Re: 關於Sendmail 8.90 vs bbsmail

※ 引述《[e-mail] (努力奮發)》之銘言：
: http://www.civil.ncku.edu.tw/~leeym/dl/sendmail-8.9.0-bbs.mailer.m4

PUSHDIVERT(-1)
#
# Copyright (c) 1998 Yen-Ming Lee (Leeym).  All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#

ifdef(`BBSMAIL_PATH',, `define(`BBSMAIL_PATH', /home/bbs/bin/bbsmail)')
ifdef(`BBSMAIL_FLAGS',, `define(`BBSMAIL_FLAGS', `lsSDFMhPu')')
ifdef(`BBSMAIL_ARGS',, `define(`BBSMAIL_ARGS', `bbsmail')')

ifdef(`MAILPOST_PATH',, `define(`MAILPOST_PATH', /home/bbs/bin/mailpost)')
ifdef(`MAILPOST_FLAGS',, `define(`MAILPOST_FLAGS', `lsSDFMhPu')')
ifdef(`MAILPOST_ARGS',, `define(`MAILPOST_ARGS', `mailpost')')

POPDIVERT
#################################
###  BBS Mailer specification ###
#################################

VERSIONID(`@(#)bbs.m4   8.10 (Leeym) 6/11/98')

Mbbsmail,       P=BBSMAIL_PATH, F=BBSMAIL_FLAGS, U=bbs, S=10, R=20/40,
                A=BBSMAIL_ARGS $u
Mmailpost,      P=MAILPOST_PATH, F=MAILPOST_FLAGS, U=bbs, S=10, R=20/40,
                A=MAILPOST_ARGS $u


: http://www.civil.ncku.edu.tw/~leeym/dl/sendmail-8.9.0-bbs.proto.m4
divert(-1)
#
# Copyright (c) 1998 Sendmail, Inc.  All rights reserved.
# Copyright (c) 1983, 1995 Eric P. Allman.  All rights reserved.
# Copyright (c) 1988, 1993
#       The Regents of the University of California.  All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#
divert(0)

VERSIONID(`@(#)proto.m4 8.218 (Berkeley) 5/19/98')

MAILER(local)dnl

# level 8 config file format
V8/Berkeley
divert(-1)

# do some sanity checking
ifdef(`__OSTYPE__',,
        `errprint(`*** ERROR: No system type defined (use OSTYPE macro)')')

# pick our default mailers
ifdef(`confSMTP_MAILER',, `define(`confSMTP_MAILER', `esmtp')')
ifdef(`confLOCAL_MAILER',, `define(`confLOCAL_MAILER', `local')')
ifdef(`confRELAY_MAILER',,
        `define(`confRELAY_MAILER',
                `ifdef(`_MAILER_smtp_', `relay',
                        `ifdef(`_MAILER_uucp', `uucp-new', `unknown')')')')
ifdef(`confUUCP_MAILER',, `define(`confUUCP_MAILER', `uucp-old')')
define(`_SMTP_', `confSMTP_MAILER')dnl          for readability only
define(`_LOCAL_', `confLOCAL_MAILER')dnl        for readability only
define(`_RELAY_', `confRELAY_MAILER')dnl        for readability only
define(`_UUCP_', `confUUCP_MAILER')dnl          for readability only

# set our default hashed database type
ifdef(`DATABASE_MAP_TYPE',, `define(`DATABASE_MAP_TYPE', `hash')')

# back compatibility with old config files
ifdef(`confDEF_GROUP_ID',
        `errprint(`*** confDEF_GROUP_ID is obsolete.')
         errprint(`    Use confDEF_USER_ID with a colon in the value instead.')')
ifdef(`confREAD_TIMEOUT',
        `errprint(`*** confREAD_TIMEOUT is obsolete.')
         errprint(`    Use individual confTO_<timeout> parameters instead.')')
ifdef(`confMESSAGE_TIMEOUT',
        `define(`_ARG_', index(confMESSAGE_TIMEOUT, /))
         ifelse(_ARG_, -1,
                `define(`confTO_QUEUERETURN', confMESSAGE_TIMEOUT)',
                `define(`confTO_QUEUERETURN',
                        substr(confMESSAGE_TIMEOUT, 0, _ARG_))
                 define(`confTO_QUEUEWARN',
                        substr(confMESSAGE_TIMEOUT, eval(_ARG_+1)))')')
ifdef(`confMIN_FREE_BLOCKS', `ifelse(index(confMIN_FREE_BLOCKS, /), -1,,
        `errprint(`*** compound confMIN_FREE_BLOCKS is obsolete.')
         errprint(`    Use confMAX_MESSAGE_SIZE for the second part of the value.')')')

# clean option definitions below....
define(`_OPTION', `ifdef(`$2', `O $1=$2', `#O $1`'ifelse($3, `',, `=$3')')')dnl

divert(0)dnl

# override file safeties - setting this option compromises system security
# need to set this now for the sake of class files
_OPTION(DontBlameSendmail, `confDONT_BLAME_SENDMAIL', safe)

##################
#   local info   #
##################

Cwlocalhost
ifdef(`USE_CW_FILE',
`# file containing names of hosts for which we receive email
Fw`'confCW_FILE',
        `dnl')

# my official domain name
# ... `define' this only if sendmail cannot automatically determine your domain
ifdef(`confDOMAIN_NAME', `Dj`'confDOMAIN_NAME', `#Dj$w.Foo.COM')

ifdef(`_NULL_CLIENT_ONLY_', `divert(-1)')dnl

CP.

ifdef(`UUCP_RELAY',
`# UUCP relay host
DY`'UUCP_RELAY
CPUUCP

')dnl
ifdef(`BITNET_RELAY',
`#  BITNET relay host
DB`'BITNET_RELAY
CPBITNET

')dnl
ifdef(`DECNET_RELAY',
`define(`_USE_DECNET_SYNTAX_', 1)dnl
# DECnet relay host
DC`'DECNET_RELAY
CPDECNET

')dnl
ifdef(`FAX_RELAY',
`# FAX relay host
DF`'FAX_RELAY
CPFAX

')dnl
# "Smart" relay host (may be null)
DS`'ifdef(`SMART_HOST', SMART_HOST)

ifdef(`LUSER_RELAY', `dnl
# place to which unknown users should be forwarded
Kuser user -m -a<>
DL`'LUSER_RELAY',
`dnl')

# operators that cannot be in local usernames (i.e., network indicators)
CO @ % ifdef(`_NO_UUCP_', `', `!')

# a class with just dot (for identifying canonical names)
C..

# a class with just a left bracket (for identifying domain literals)
C[[

ifdef(`MAILER_TABLE', `dnl
# Mailer table (overriding domains)
Kmailertable MAILER_TABLE',
`dnl')

ifdef(`DOMAIN_TABLE', `dnl
# Domain table (adding domains)
Kdomaintable DOMAIN_TABLE',
`dnl')

ifdef(`GENERICS_TABLE', `dnl
# Generics table (mapping outgoing addresses)
Kgenerics GENERICS_TABLE',
`dnl')

ifdef(`UUDOMAIN_TABLE', `dnl
# UUCP domain table
Kuudomain UUDOMAIN_TABLE',
`dnl')

ifdef(`BITDOMAIN_TABLE', `dnl
# BITNET mapping table
Kbitdomain BITDOMAIN_TABLE',
`dnl')

ifdef(`VIRTUSER_TABLE', `dnl
# Virtual user table (maps incoming users)
Kvirtuser VIRTUSER_TABLE',
`dnl')

ifdef(`ACCESS_TABLE', `dnl
# Access list database (for spam stomping)
Kaccess ACCESS_TABLE',
`dnl')

ifdef(`_RELAY_MX_SERVED_', `dnl
# MX map (to allow relaying to hosts that we MX for)
Kmxserved bestmx -z: -T<TEMP>',
`dnl')

ifdef(`_ACCEPT_UNRESOLVABLE_DOMAINS_',`dnl',`dnl
# Resolve map (to check if a host exists in check_mail)
Kresolve host -a<OK> -T<TEMP>')

ifdef(`confCR_FILE', `dnl
# Hosts that will permit relaying ($=R)
FR`'confCR_FILE',
`dnl')

# who I send unqualified names to (null means deliver locally)
DR`'ifdef(`LOCAL_RELAY', LOCAL_RELAY)

# who gets all local email traffic ($R has precedence for unqualified names)
DH`'ifdef(`MAIL_HUB', MAIL_HUB)

# dequoting map
Kdequote dequote

divert(0)dnl    # end of nullclient diversion
# class E: names that should be exposed as from this host, even if we masquerade
ifdef(`_NULL_CLIENT_ONLY_', `#',
`# class L: names that should be delivered locally, even if we have a relay
# class M: domains that should be converted to $M
#CL root
')CE root
undivert(5)dnl

# who I masquerade as (null for no masquerading) (see also $=M)
DM`'ifdef(`MASQUERADE_NAME', MASQUERADE_NAME)

# my name for error messages
ifdef(`confMAILER_NAME', `Dn`'confMAILER_NAME', `#DnMAILER-DAEMON')

undivert(6)dnl
include(_CF_DIR_`m4/version.m4')

###############
#   Options   #
###############

# strip message body to 7 bits on input?
_OPTION(SevenBitInput, `confSEVEN_BIT_INPUT')

# 8-bit data handling
_OPTION(EightBitMode, `confEIGHT_BIT_HANDLING', adaptive)

ifdef(`_NULL_CLIENT_ONLY_', `dnl', `
# wait for alias file rebuild (default units: minutes)
_OPTION(AliasWait, `confALIAS_WAIT', 5m)

# location of alias file
_OPTION(AliasFile, `ALIAS_FILE', /etc/aliases)
')
# minimum number of free blocks on filesystem
_OPTION(MinFreeBlocks, `confMIN_FREE_BLOCKS', 100)

# maximum message size
_OPTION(MaxMessageSize, `confMAX_MESSAGE_SIZE', 1000000)

# substitution for space (blank) characters
_OPTION(BlankSub, `confBLANK_SUB', _)

# avoid connecting to "expensive" mailers on initial submission?
_OPTION(HoldExpensive, `confCON_EXPENSIVE')

# checkpoint queue runs after every N successful deliveries
_OPTION(CheckpointInterval, `confCHECKPOINT_INTERVAL', 10)

# default delivery mode
_OPTION(DeliveryMode, `confDELIVERY_MODE', background)

# automatically rebuild the alias database?
_OPTION(AutoRebuildAliases, `confAUTO_REBUILD')

# error message header/file
_OPTION(ErrorHeader, `confERROR_MESSAGE', /etc/sendmail.oE)

# error mode
_OPTION(ErrorMode, `confERROR_MODE', print)

# save Unix-style "From_" lines at top of header?
_OPTION(SaveFromLine, `confSAVE_FROM_LINES')

# temporary file mode
_OPTION(TempFileMode, `confTEMP_FILE_MODE', 0600)

# match recipients against GECOS field?
_OPTION(MatchGECOS, `confMATCH_GECOS')

# maximum hop count
_OPTION(MaxHopCount, `confMAX_HOP', 17)

# location of help file
O HelpFile=ifdef(`HELP_FILE', HELP_FILE, /usr/lib/sendmail.hf)

# ignore dots as terminators in incoming messages?
_OPTION(IgnoreDots, `confIGNORE_DOTS')

# name resolver options
_OPTION(ResolverOptions, `confBIND_OPTS', +AAONLY)

# deliver MIME-encapsulated error messages?
_OPTION(SendMimeErrors, `confMIME_FORMAT_ERRORS')

# Forward file search path
_OPTION(ForwardPath, `confFORWARD_PATH', /var/forward/$u:$z/.forward.$w:$z/.forward)

# open connection cache size
_OPTION(ConnectionCacheSize, `confMCI_CACHE_SIZE', 2)

# open connection cache timeout
_OPTION(ConnectionCacheTimeout, `confMCI_CACHE_TIMEOUT', 5m)

# persistent host status directory
_OPTION(HostStatusDirectory, `confHOST_STATUS_DIRECTORY', .hoststat)

# single thread deliveries (requires HostStatusDirectory)?
_OPTION(SingleThreadDelivery, `confSINGLE_THREAD_DELIVERY')

# use Errors-To: header?
_OPTION(UseErrorsTo, `confUSE_ERRORS_TO')

# log level
_OPTION(LogLevel, `confLOG_LEVEL', 10)

# send to me too, even in an alias expansion?
_OPTION(MeToo, `confME_TOO')

# verify RHS in newaliases?
_OPTION(CheckAliases, `confCHECK_ALIASES')

# default messages to old style headers if no special punctuation?
_OPTION(OldStyleHeaders, `confOLD_STYLE_HEADERS')

# SMTP daemon options
_OPTION(DaemonPortOptions, `confDAEMON_OPTIONS', Port=esmtp)

# privacy flags
_OPTION(PrivacyOptions, `confPRIVACY_FLAGS', authwarnings)

# who (if anyone) should get extra copies of error messages
_OPTION(PostMasterCopy, `confCOPY_ERRORS_TO', Postmaster)

# slope of queue-only function
_OPTION(QueueFactor, `confQUEUE_FACTOR', 600000)

# queue directory
O QueueDirectory=ifdef(`QUEUE_DIR', QUEUE_DIR, /var/spool/mqueue)

# timeouts (many of these)
_OPTION(Timeout.initial, `confTO_INITIAL', 5m)
_OPTION(Timeout.connect, `confTO_CONNECT', 5m)
_OPTION(Timeout.iconnect, `confTO_ICONNECT', 5m)
_OPTION(Timeout.helo, `confTO_HELO', 5m)
_OPTION(Timeout.mail, `confTO_MAIL', 10m)
_OPTION(Timeout.rcpt, `confTO_RCPT', 1h)
_OPTION(Timeout.datainit, `confTO_DATAINIT', 5m)
_OPTION(Timeout.datablock, `confTO_DATABLOCK', 1h)
_OPTION(Timeout.datafinal, `confTO_DATAFINAL', 1h)
_OPTION(Timeout.rset, `confTO_RSET', 5m)
_OPTION(Timeout.quit, `confTO_QUIT', 2m)
_OPTION(Timeout.misc, `confTO_MISC', 2m)
_OPTION(Timeout.command, `confTO_COMMAND', 1h)
_OPTION(Timeout.ident, `confTO_IDENT', 30s)
_OPTION(Timeout.fileopen, `confTO_FILEOPEN', 60s)
_OPTION(Timeout.queuereturn, `confTO_QUEUERETURN', 5d)
_OPTION(Timeout.queuereturn.normal, `confTO_QUEUERETURN_NORMAL', 5d)
_OPTION(Timeout.queuereturn.urgent, `confTO_QUEUERETURN_URGENT', 2d)
_OPTION(Timeout.queuereturn.non-urgent, `confTO_QUEUERETURN_NONURGENT', 7d)
_OPTION(Timeout.queuewarn, `confTO_QUEUEWARN', 4h)
_OPTION(Timeout.queuewarn.normal, `confTO_QUEUEWARN_NORMAL', 4h)
_OPTION(Timeout.queuewarn.urgent, `confTO_QUEUEWARN_URGENT', 1h)
_OPTION(Timeout.queuewarn.non-urgent, `confTO_QUEUEWARN_NONURGENT', 12h)
_OPTION(Timeout.hoststatus, `confTO_HOSTSTATUS', 30m)

# should we not prune routes in route-addr syntax addresses?
_OPTION(DontPruneRoutes, `confDONT_PRUNE_ROUTES')

# queue up everything before forking?
_OPTION(SuperSafe, `confSAFE_QUEUE')

# status file
O StatusFile=ifdef(`STATUS_FILE', `STATUS_FILE', /etc/sendmail.st)

# time zone handling:
#  if undefined, use system default
#  if defined but null, use TZ envariable passed in
#  if defined and non-null, use that info
ifelse(confTIME_ZONE, `USE_SYSTEM', `#O TimeZoneSpec=',
        confTIME_ZONE, `USE_TZ', `O TimeZoneSpec=',
        `O TimeZoneSpec=confTIME_ZONE')

# default UID (can be username or userid:groupid)
_OPTION(DefaultUser, `confDEF_USER_ID', mailnull)

# list of locations of user database file (null means no lookup)
_OPTION(UserDatabaseSpec, `confUSERDB_SPEC', /etc/userdb)

# fallback MX host
_OPTION(FallbackMXhost, `confFALLBACK_MX', fall.back.host.net)

# if we are the best MX host for a site, try it directly instead of config err
_OPTION(TryNullMXList, `confTRY_NULL_MX_LIST')

# load average at which we just queue messages
_OPTION(QueueLA, `confQUEUE_LA', 8)

# load average at which we refuse connections
_OPTION(RefuseLA, `confREFUSE_LA', 12)

# maximum number of children we allow at one time
_OPTION(MaxDaemonChildren, `confMAX_DAEMON_CHILDREN', 12)

# maximum number of new connections per second
_OPTION(ConnectionRateThrottle, `confCONNECTION_RATE_THROTTLE', 3)

# work recipient factor
_OPTION(RecipientFactor, `confWORK_RECIPIENT_FACTOR', 30000)

# deliver each queued job in a separate process?
_OPTION(ForkEachJob, `confSEPARATE_PROC')

# work class factor
_OPTION(ClassFactor, `confWORK_CLASS_FACTOR', 1800)

# work time factor
_OPTION(RetryFactor, `confWORK_TIME_FACTOR', 90000)

# shall we sort the queue by hostname first?
_OPTION(QueueSortOrder, `confQUEUE_SORT_ORDER', priority)

# minimum time in queue before retry
_OPTION(MinQueueAge, `confMIN_QUEUE_AGE', 30m)

# default character set
_OPTION(DefaultCharSet, `confDEF_CHAR_SET', iso-8859-1)

# service switch file (ignored on Solaris, Ultrix, OSF/1, others)
_OPTION(ServiceSwitchFile, `confSERVICE_SWITCH_FILE', /etc/service.switch)

# hosts file (normally /etc/hosts)
_OPTION(HostsFile, `confHOSTS_FILE', /etc/hosts)

# dialup line delay on connection failure
_OPTION(DialDelay, `confDIAL_DELAY', 10s)

# action to take if there are no recipients in the message
_OPTION(NoRecipientAction, `confNO_RCPT_ACTION', add-to-undisclosed)

# chrooted environment for writing to files
_OPTION(SafeFileEnvironment, `confSAFE_FILE_ENV', /arch)

# are colons OK in addresses?
_OPTION(ColonOkInAddr, `confCOLON_OK_IN_ADDR')

# how many jobs can you process in the queue?
_OPTION(MaxQueueRunSize, `confMAX_QUEUE_RUN_SIZE', 10000)

# shall I avoid expanding CNAMEs (violates protocols)?
_OPTION(DontExpandCnames, `confDONT_EXPAND_CNAMES')

# SMTP initial login message (old $e macro)
_OPTION(SmtpGreetingMessage, `confSMTP_LOGIN_MSG')

# UNIX initial From header format (old $l macro)
_OPTION(UnixFromLine, `confFROM_LINE')

# From: lines that have embedded newlines are unwrapped onto one line
_OPTION(SingleLineFromHeader, `confSINGLE_LINE_FROM_HEADER', False)

# Allow HELO SMTP command that does not `include' a host name
_OPTION(AllowBogusHELO, `confALLOW_BOGUS_HELO', False)

# Characters to be quoted in a full name phrase (@,;:\()[] are automatic)
_OPTION(MustQuoteChars, `confMUST_QUOTE_CHARS', .)

# delimiter (operator) characters (old $o macro)
_OPTION(OperatorChars, `confOPERATORS')

# shall I avoid calling initgroups(3) because of high NIS costs?
_OPTION(DontInitGroups, `confDONT_INIT_GROUPS')

# are group-writable `:include:' and .forward files (un)trustworthy?
_OPTION(UnsafeGroupWrites, `confUNSAFE_GROUP_WRITES')

# where do errors that occur when sending errors get sent?
_OPTION(DoubleBounceAddress, `confDOUBLE_BOUNCE_ADDRESS', postmaster)

# what user id do we assume for the majority of the processing?
_OPTION(RunAsUser, `confRUN_AS_USER', sendmail)

# maximum number of recipients per SMTP envelope
_OPTION(MaxRecipientsPerMessage, `confMAX_RCPTS_PER_MESSAGE', 100)

# shall we get local names from our installed interfaces?
_OPTION(DontProbeInterfaces, `confDONT_PROBE_INTERFACES')

###########################
#   Message precedences   #
###########################

Pfirst-class=0
Pspecial-delivery=100
Plist=-30
Pbulk=-60
Pjunk=-100

#####################
#   Trusted users   #
#####################

# this is equivalent to setting class "t"
ifdef(`_USE_CT_FILE_', `', `#')Ft`'ifdef(`confCT_FILE', confCT_FILE, `/etc/sendmail.ct')
Troot
Tdaemon
ifdef(`_NO_UUCP_', `dnl', `Tuucp')
ifdef(`confTRUSTED_USERS', `T`'confTRUSTED_USERS', `dnl')

#########################
#   Format of headers   #
#########################

ifdef(`confFROM_HEADER',, `define(`confFROM_HEADER', `$?x$x <$g>$|$g$.')')dnl
H?P?Return-Path: <$g>
HReceived: confRECEIVED_HEADER
H?D?Resent-Date: $a
H?D?Date: $a
H?F?Resent-From: confFROM_HEADER
H?F?From: confFROM_HEADER
H?x?Full-Name: $x
# HPosted-Date: $a
# H?l?Received-Date: $b
H?M?Resent-Message-Id: <$t.$i@$j>
H?M?Message-Id: <$t.$i@$j>
ifdef(`_NULL_CLIENT_ONLY_',
        `include(_CF_DIR_`'m4/nullrelay.m4)m4exit',
        `dnl')
#
######################################################################
######################################################################
#####
#####                   REWRITING RULES
#####
######################################################################
######################################################################

############################################
###  Ruleset 3 -- Name Canonicalization  ###
############################################
S3

# handle null input (translate to <@> special case)
R$@                     $@ <@>

# strip group: syntax (not inside angle brackets!) and trailing semicolon
R$*                     $: $1 <@>                       mark addresses
R$* < $* > $* <@>       $: $1 < $2 > $3                 unmark <addr>
R@ $* <@>               $: @ $1                         unmark @host:...
R$* :: $* <@>           $: $1 :: $2                     unmark node::addr
R:`include': $* <@>     $: :`include': $1                       unmark :`include':...
R$* [ $* : $* ] <@>     $: $1 [ $2 : $3 ]               unmark IPv6 addrs
R$* : $* [ $* ]         $: $1 : $2 [ $3 ] <@>           remark if leading colon
R$* : $* <@>            $: $2                           strip colon if marked
R$* <@>                 $: $1                           unmark
R$* ;                      $1                           strip trailing semi
R$* < $* ; >               $1 < $2 >                    bogus bracketed semi

# null input now results from list:; syntax
R$@                     $@ :; <@>

# strip angle brackets -- note RFC733 heuristic to get innermost item
R$*                     $: < $1 >                       housekeeping <>
R$+ < $* >                 < $2 >                       strip excess on left
R< $* > $+                 < $1 >                       strip excess on right
R<>                     $@ < @ >                        MAIL FROM:<> case
R< $+ >                 $: $1                           remove housekeeping <>

# make sure <@a,@b,@c:user@d> syntax is easy to parse -- undone later
R@ $+ , $+              @ $1 : $2                       change all "," to ":"

# localize and dispose of route-based addresses
R@ $+ : $+              $@ $>96 < @$1 > : $2            handle <route-addr>

# find focus for list syntax
R $+ : $* ; @ $+        $@ $>96 $1 : $2 ; < @ $3 >      list syntax
R $+ : $* ;             $@ $1 : $2;                     list syntax

# find focus for @ syntax addresses
R$+ @ $+                $: $1 < @ $2 >                  focus on domain
R$+ < $+ @ $+ >         $1 $2 < @ $3 >                  move gaze right
R$+ < @ $+ >            $@ $>96 $1 < @ $2 >             already canonical

# do some sanity checking
R$* < @ $* : $* > $*    $1 < @ $2 $3 > $4               nix colons in addrs

ifdef(`_NO_UUCP_', `dnl',
`# convert old-style addresses to a domain-based address
R$- ! $+                $@ $>96 $2 < @ $1 .UUCP >       resolve uucp names
R$+ . $- ! $+           $@ $>96 $3 < @ $1 . $2 >                domain uucps
R$+ ! $+                $@ $>96 $2 < @ $1 .UUCP >       uucp subdomains
')
ifdef(`_USE_DECNET_SYNTAX_',
`# convert node::user addresses into a domain-based address
R$- :: $+               $@ $>96 $2 < @ $1 .DECNET >     resolve DECnet names
R$- . $- :: $+          $@ $>96 $3 < @ $1.$2 .DECNET >  numeric DECnet addr
',
        `dnl')
# if we have % signs, take the rightmost one
R$* % $*                $1 @ $2                         First make them all @s.
R$* @ $* @ $*           $1 % $2 @ $3                    Undo all but the last.
R$* @ $*                $@ $>96 $1 < @ $2 >             Insert < > and finish

# else we must be a local name
R$*                     $@ $>96 $1


################################################
###  Ruleset 96 -- bottom half of ruleset 3  ###
################################################

S96

# handle special cases for local names
R$* < @ localhost > $*          $: $1 < @ $j . > $2             no domain at all
R$* < @ localhost . $m > $*     $: $1 < @ $j . > $2             local domain
ifdef(`_NO_UUCP_', `dnl',
`R$* < @ localhost . UUCP > $*  $: $1 < @ $j . > $2             .UUCP domain')
R$* < @ [ $+ ] > $*             $: $1 < @@ [ $2 ] > $3          mark [a.b.c.d]
R$* < @@ $=w > $*               $: $1 < @ $j . > $3             self-literal
R$* < @@ $+ > $*                $@ $1 < @ $2 > $3               canon IP addr

ifdef(`DOMAIN_TABLE', `dnl
# look up domains in the domain table
R$* < @ $+ > $*                 $: $1 < @ $(domaintable $2 $) > $3', `dnl')

undivert(2)dnl

ifdef(`BITDOMAIN_TABLE', `dnl
# handle BITNET mapping
R$* < @ $+ .BITNET > $*         $: $1 < @ $(bitdomain $2 $: $2.BITNET $) > $3', `dnl')

ifdef(`UUDOMAIN_TABLE', `dnl
# handle UUCP mapping
R$* < @ $+ .UUCP > $*           $: $1 < @ $(uudomain $2 $: $2.UUCP $) > $3', `dnl')

ifdef(`_NO_UUCP_', `dnl',
`ifdef(`UUCP_RELAY',
`# pass UUCP addresses straight through
R$* < @ $+ . UUCP > $*          $@ $1 < @ $2 . UUCP . > $3',
`# if really UUCP, handle it immediately
ifdef(`_CLASS_U_',
`R$* < @ $=U . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_V_',
`R$* < @ $=V . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_W_',
`R$* < @ $=W . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_X_',
`R$* < @ $=X . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_Y_',
`R$* < @ $=Y . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')

ifdef(`_NO_CANONIFY_', `dnl', `dnl
# try UUCP traffic as a local address
R$* < @ $+ . UUCP > $*          $: $1 < @ $[ $2 $] . UUCP . > $3
R$* < @ $+ . . UUCP . > $*      $@ $1 < @ $2 . > $3')
')')
ifdef(`_NO_CANONIFY_', `dnl', `dnl
# pass to name server to make hostname canonical
R$* < @ $* $~P > $*             $: $1 < @ $[ $2 $3 $] > $4')

# local host aliases and pseudo-domains are always canonical
R$* < @ $=w > $*                $: $1 < @ $2 . > $3
R$* < @ $j > $*                 $: $1 < @ $j . > $2
ifdef(`_MASQUERADE_ENTIRE_DOMAIN_',
`R$* < @ $* $=M > $*            $: $1 < @ $2 $3 . > $4',
`R$* < @ $=M > $*               $: $1 < @ $2 . > $3')
R$* < @ $* $=P > $*             $: $1 < @ $2 $3 . > $4
R$* < @ $* . . > $*             $1 < @ $2 . > $3


##################################################
###  Ruleset 4 -- Final Output Post-rewriting  ###
##################################################
S4

R$* <@>                 $@                              handle <> and list:;

# strip trailing dot off possibly canonical name
R$* < @ $+ . > $*       $1 < @ $2 > $3

# eliminate internal code -- should never get this far!
R$* < @ *LOCAL* > $*    $1 < @ $j > $2

# externalize local domain info
R$* < $+ > $*           $1 $2 $3                        defocus
R@ $+ : @ $+ : $+       @ $1 , @ $2 : $3                <route-addr> canonical
R@ $*                   $@ @ $1                         ... and exit

ifdef(`_NO_UUCP_', `dnl',
`# UUCP must always be presented in old form
R$+ @ $- . UUCP         $2!$1                           [e-mail] => h!u')

ifdef(`_USE_DECNET_SYNTAX_',
`# put DECnet back in :: form
R$+ @ $+ . DECNET       $2 :: $1                        [e-mail] => h::u',
        `dnl')
# delete duplicate local names
R$+ % $=w @ $=w         $1 @ $2                         u%host@host => u@host



##############################################################
###   Ruleset 97 -- recanonicalize and call ruleset zero   ###
###                (used for recursive calls)              ###
##############################################################

S`'97
R$*                     $: $>3 $1
R$*                     $@ $>0 $1


######################################
###   Ruleset 0 -- Parse Address   ###
######################################

S0

R$*                     $: $>Parse0 $1          initial parsing
ifdef(`_MAILER_bbs_',`dnl
# bbsmail and mailpost add by Leeym
Rbbs < @ $=w . >        $#mailpost $: bbs       mailpost for bbs
R$+.bbs < @ $=w . >     $#bbsmail $: $1         bbs mail gateway',
        `dnl')
R<@>                    $#_LOCAL_ $: <@>                special case error msgs
R$*                     $: $>98 $1              handle local hacks
R$*                     $: $>Parse1 $1          final parsing

#
#  Parse0 -- do initial syntax checking and eliminate local addresses.
#       This should either return with the (possibly modified) input
#       or return with a #error mailer.  It should not return with a
#       #mailer other than the #error mailer.
#

SParse0
R<@>                    $@ <@>                  special case error msgs
R$* : $* ; <@>          $#error $@ 5.1.3 $: "List:; syntax illegal for recipient addresses"
R<@ $+>                 $#error $@ 5.1.3 $: "User address required"
R$*                     $: <> $1
R<> $* < @ [ $+ ] > $*  $1 < @ [ $2 ] > $3
R<> $* <$* : $* > $*    $#error $@ 5.1.3 $: "Colon illegal in host name part"
R<> $*                  $1
R$* < @ . $* > $*       $#error $@ 5.1.2 $: "Invalid host name"
R$* < @ $* .. $* > $*   $#error $@ 5.1.2 $: "Invalid host name"

# now delete the local info -- note $=O to find characters that cause forwarding
R$* < @ > $*            $@ $>Parse0 $>3 $1              user@ => user
R< @ $=w . > : $*       $@ $>Parse0 $>3 $2              @here:... -> ...
R$- < @ $=w . >         $: $(dequote $1 $) < @ $2 . >   dequote "foo"@here
R< @ $+ >               $#error $@ 5.1.3 $: "User address required"
R$* $=O $* < @ $=w . >  $@ $>Parse0 $>3 $1 $2 $3        ...@here -> ...
R$-                     $: $(dequote $1 $) < @ *LOCAL* >        dequote "foo"
R< @ *LOCAL* >          $#error $@ 5.1.3 $: "User address required"
R$* $=O $* < @ *LOCAL* >
                        $@ $>Parse0 $>3 $1 $2 $3        ...@*LOCAL* -> ...
R$* < @ *LOCAL* >       $: $1

#
#  Parse1 -- the bottom half of ruleset 0.
#

SParse1
ifdef(`_MAILER_smtp_',
`# handle numeric address spec
R$* < @ [ $+ ] > $*     $: $>98 $1 < @ [ $2 ] > $3      numeric internet spec
R$* < @ [ $+ ] > $*     $#_SMTP_ $@ [$2] $: $1 < @ [$2] > $3    still numeric: send',
        `dnl')

ifdef(`VIRTUSER_TABLE', `dnl
# handle virtual users
R$+ < @ $=w . >         $: < $(virtuser $1 @ $2 $@ $1 $: @ $) > $1 < @ $2 . >
R<@> $+ + $* < @ $* . >
                        $: < $(virtuser $1 + * @ $3 $@ $1 $: @ $) > $1 + $2 < @ $3 . >
R<@> $+ + $* < @ $* . >
                        $: < $(virtuser $1 @ $3 $@ $1 $: @ $) > $1 + $2 < @ $3 . >
R<@> $+ < @ $+ . >      $: < $(virtuser @ $2 $@ $1 $: @ $) > $1 < @ $2 . >
R<@> $+                 $: $1
R< error : $- $+ > $*   $#error $@ $(dequote $1 $) $: $2
R< $+ > $+ < @ $+ >     $: $>97 $1',
`dnl')

# short circuit local delivery so forwarded email works
ifdef(`_MAILER_usenet_', `dnl
R$+ . USENET < @ $=w . >        $#usenet $: $1          handle usenet specially', `dnl')
ifdef(`_STICKY_LOCAL_DOMAIN_',
`R$+ < @ $=w . >                $: < $H > $1 < @ $2 . >         first try hub
R< $+ > $+ < $+ >       $>95 < $1 > $2 < $3 >           yep ....
R< > $+ + $* < $+ >     $#_LOCAL_ $: $1 + $2            plussed name?
R< > $+ < $+ >          $#_LOCAL_ $: @ $1                       nope, local address',
`R$=L < @ $=w . >       $#_LOCAL_ $: @ $1               special local names
R$+ < @ $=w . >         $#_LOCAL_ $: $1                 regular local name')

ifdef(`MAILER_TABLE', `dnl
# not local -- try mailer table lookup
R$* <@ $+ > $*          $: < $2 > $1 < @ $2 > $3        extract host name
R< $+ . > $*            $: < $1 > $2                    strip trailing dot
R< $+ > $*              $: < $(mailertable $1 $) > $2   lookup
R< $~[ : $+ > $*        $>95 < $1 : $2 > $3             check -- resolved?
R< $+ > $*              $: $>90 <$1> $2                 try domain',
`dnl')
undivert(4)dnl

ifdef(`_NO_UUCP_', `dnl',
`# resolve remotely connected UUCP links (if any)
ifdef(`_CLASS_V_',
`R$* < @ $=V . UUCP . > $*              $: $>95 < $V > $1 <@$2.UUCP.> $3',
        `dnl')
ifdef(`_CLASS_W_',
`R$* < @ $=W . UUCP . > $*              $: $>95 < $W > $1 <@$2.UUCP.> $3',
        `dnl')
ifdef(`_CLASS_X_',
`R$* < @ $=X . UUCP . > $*              $: $>95 < $X > $1 <@$2.UUCP.> $3',
        `dnl')')

# resolve fake top level domains by forwarding to other hosts
ifdef(`BITNET_RELAY',
`R$*<@$+.BITNET.>$*     $: $>95 < $B > $1 <@$2.BITNET.> $3      [e-mail]',
        `dnl')
ifdef(`DECNET_RELAY',
`R$*<@$+.DECNET.>$*     $: $>95 < $C > $1 <@$2.DECNET.> $3      [e-mail]',
        `dnl')
ifdef(`_MAILER_pop_',
`R$+ < @ POP. >         $#pop $: $1                     user@POP',
        `dnl')
ifdef(`_MAILER_fax_',
`R$+ < @ $+ .FAX. >     $#fax $@ $2 $: $1               [e-mail]',
`ifdef(`FAX_RELAY',
`R$*<@$+.FAX.>$*                $: $>95 < $F > $1 <@$2.FAX.> $3 [e-mail]',
        `dnl')')

ifdef(`UUCP_RELAY',
`# forward non-local UUCP traffic to our UUCP relay
R$*<@$*.UUCP.>$*                $: $>95 < $Y > $1 <@$2.UUCP.> $3        uucp mail',
`ifdef(`_MAILER_uucp_',
`# forward other UUCP traffic straight to UUCP
R$* < @ $+ .UUCP. > $*          $#_UUCP_ $@ $2 $: $1 < @ $2 .UUCP. > $3 [e-mail]',
        `dnl')')
ifdef(`_MAILER_usenet_', `
# addresses sent to net.group.USENET will get forwarded to a newsgroup
R$+ . USENET            $#usenet $: $1',
        `dnl')

ifdef(`_LOCAL_RULES_',
`# figure out what should stay in our local mail system
undivert(1)', `dnl')

# pass names that still have a host to a smarthost (if defined)
R$* < @ $* > $*         $: $>95 < $S > $1 < @ $2 > $3   glue on smarthost name

# deal with other remote names
ifdef(`_MAILER_smtp_',
`R$* < @$* > $*         $#_SMTP_ $@ $2 $: $1 < @ $2 > $3                [e-mail]',
`R$* < @$* > $*         $#error $@ 5.1.2 $: "Unrecognized host name" $2')

# handle locally delivered names
R$=L                    $#_LOCAL_ $: @ $1                       special local names
ifdef(`_MAILER_bbs_',`dnl
Rbbs                    $#mailpost $: bbs       mailpost for bbs
R$+.bbs                 $#bbsmail $: $1         bbs mail gateway',
        `dnl')
R$+                     $#_LOCAL_ $: $1                 regular local names

###########################################################################
###   Ruleset 5 -- special rewriting after aliases have been expanded   ###
###########################################################################

S5

# deal with plussed users so aliases work nicely
R$+ + *                 $#_LOCAL_ $@ $&h $: $1
R$+ + $*                $#_LOCAL_ $@ + $2 $: $1 + *

# prepend an empty "forward host" on the front
R$+                     $: <> $1

ifdef(`LUSER_RELAY', `dnl
# send unrecognized local users to a relay host
R< > $+                 $: < $L . > $(user $1 $)        look up user
R< $* > $+ <> $*        $: < > $2 $3                    found; strip $L
R< $* . > $+            $: < $1 > $2                    strip extra dot',
`dnl')

# see if we have a relay or a hub
R< > $+                 $: < $H > $1                    try hub
R< > $+                 $: < $R > $1                    try relay
R< > $+                 $: < > < $1 $&h >               nope, restore +detail
R< > < $+ + $* > $*        < > < $1 > + $2 $3           find the user part
R< > < $+ > + $*        $#_LOCAL_ $@ $2 $: @ $1         strip the extra +
R< > < $+ >             $@ $1                           no +detail
R$+                     $: $1 $&h                       add +detail back in
R< local : $* > $*      $: $>95 < local : $1 > $2       no host extension
R< error : $* > $*      $: $>95 < error : $1 > $2       no host extension
R< $- : $+ > $+         $: $>95 < $1 : $2 > $3 < @ $2 >
R< $+ > $+              $@ $>95 < $1 > $2 < @ $1 >

ifdef(`MAILER_TABLE', `dnl
###################################################################
###  Ruleset 90 -- try domain part of mailertable entry         ###
###################################################################

S90
R$* <$- . $+ > $*       $: $1$2 < $(mailertable .$3 $@ $1$2 $@ $2 $) > $4
R$* <$~[ : $+ > $*      $>95 < $2 : $3 > $4             check -- resolved?
R$* < . $+ > $*         $@ $>90 $1 . <$2> $3            no -- strip & try again
R$* < $* > $*           $: < $(mailertable . $@ $1$2 $) > $3    try "."
R< $~[ : $+ > $*        $>95 < $1 : $2 > $3             "." found?
R< $* > $*              $@ $2                           no mailertable match',
`dnl')

###################################################################
###  Ruleset 95 -- canonify mailer:[user@]host syntax to triple ###
###################################################################

S95
R< > $*                         $@ $1                   strip off null relay
R< error : $- $+ > $*           $#error $@ $(dequote $1 $) $: $2
R< local : $* > $*              $>CanonLocal < $1 > $2
R< $- : $+ @ $+ > $*<$*>$*      $# $1 $@ $3 $: $2<@$3>  use literal user
R< $- : $+ > $*                 $# $1 $@ $2 $: $3       try qualified mailer
R< $=w > $*                     $@ $2                   delete local host
R< $+ > $*                      $#_RELAY_ $@ $1 $: $2   use unqualified mailer

###################################################################
###  Ruleset CanonLocal -- canonify local: syntax               ###
###################################################################

SCanonLocal
# strip trailing dot from any host name that may appear
R< $* > $* < @ $* . >           $: < $1 > $2 < @ $3 >

# handle local: syntax -- use old user, either with or without host
R< > $* < @ $* > $*             $#_LOCAL_ $@ $1@$2 $: $1
R< > $+                         $#_LOCAL_ $@ $1    $: $1

# handle local:user@host syntax -- ignore host part
R< $+ @ $+ > $* < @ $* >        $: < $1 > $3 < @ $4 >

# handle local:user syntax
R< $+ > $* <@ $* > $*           $#_LOCAL_ $@ $2@$3 $: $1
R< $+ > $*                      $#_LOCAL_ $@ $2    $: $1

###################################################################
###  Ruleset 93 -- convert header names to masqueraded form     ###
###################################################################

S93

ifdef(`GENERICS_TABLE', `dnl
# handle generics database
ifdef(`_GENERICS_ENTIRE_DOMAIN_',
`R$+ < @ $* $=G . >     $: < $1@$2$3 > $1 < @ $2$3 . > @        mark',
`R$+ < @ $=G . >        $: < $1@$2 > $1 < @ $2 . > @    mark')
R$+ < @ *LOCAL* >       $: < $1@$j > $1 < @ *LOCAL* > @ mark
R< $+ > $+ < $* > @     $: < $(generics $1 $: $) > $2 < $3 >
R< > $+ < @ $+ >        $: < $(generics $1 $: $) > $1 < @ $2 >
R< $* @ $* > $* < $* >  $@ $>3 $1 @ $2                  found qualified
R< $+ > $* < $* >       $: $>3 $1 @ *LOCAL*             found unqualified
R< > $*                 $: $1                           not found',
`dnl')

# special case the users that should be exposed
R$=E < @ *LOCAL* >      $@ $1 < @ $j . >                leave exposed
ifdef(`_MASQUERADE_ENTIRE_DOMAIN_',
`R$=E < @ $* $=M . >    $@ $1 < @ $2 $3 . >',
`R$=E < @ $=M . >       $@ $1 < @ $2 . >')
ifdef(`_LIMITED_MASQUERADE_', `dnl',
`R$=E < @ $=w . >       $@ $1 < @ $2 . >')

# handle domain-specific masquerading
ifdef(`_MASQUERADE_ENTIRE_DOMAIN_',
`R$* < @ $* $=M . > $*  $: $1 < @ $2 $3 . @ $M > $4     convert masqueraded doms',
`R$* < @ $=M . > $*     $: $1 < @ $2 . @ $M > $3        convert masqueraded doms')
ifdef(`_LIMITED_MASQUERADE_', `dnl',
`R$* < @ $=w . > $*     $: $1 < @ $2 . @ $M > $3')
R$* < @ *LOCAL* > $*    $: $1 < @ $j . @ $M > $2
R$* < @ $+ @ > $*       $: $1 < @ $2 > $3               $M is null
R$* < @ $+ @ $+ > $*    $: $1 < @ $3 . > $4             $M is not null

###################################################################
###  Ruleset 94 -- convert envelope names to masqueraded form   ###
###################################################################

S94
ifdef(`_MASQUERADE_ENVELOPE_',
`R$+                    $@ $>93 $1',
`R$* < @ *LOCAL* > $*   $: $1 < @ $j . > $2')

###################################################################
###  Ruleset 98 -- local part of ruleset zero (can be null)     ###
###################################################################

S98
undivert(3)dnl

ifelse(confDELIVERY_MODE, defer, `errprint(`WARNING: Antispam rules not available in deferred delivery mode.')')
ifdef(`ACCESS_TABLE', `dnl
######################################################################
###  LookUpDomain -- search for domain in access database
###
###     Parameters:
###             <$1> -- key (domain name)
###             <$2> -- default (what to return if not found in db)
###             <$3> -- passthru (additional data passed unchanged through)
######################################################################

SLookUpDomain
R<$+> <$+> <$*>         $: < $(access $1 $: ? $) > <$1> <$2> <$3>
R<?> <$+.$+> <$+> <$*>  $@ $>LookUpDomain <$2> <$3> <$4>
R<?> <$+> <$+> <$*>     $@ <$2> <$3>
R<$*> <$+> <$+> <$*>    $@ <$1> <$4>

######################################################################
###  LookUpAddress -- search for host address in access database
###
###     Parameters:
###             <$1> -- key (dot quadded host address)
###             <$2> -- default (what to return if not found in db)
###             <$3> -- passthru (additional data passed through)
######################################################################

SLookUpAddress
R<$+> <$+> <$*>         $: < $(access $1 $: ? $) > <$1> <$2> <$3>
R<?> <$+.$-> <$+> <$*>  $@ $>LookUpAddress <$1> <$3> <$4>
R<?> <$+> <$+> <$*>     $@ <$2> <$3>
R<$*> <$+> <$+> <$*>    $@ <$1> <$4>',
`dnl')

######################################################################
###  ParseRecipient --  Strip off hosts in $=R as well as possibly
###                     $* $=m or the access database.
###                     Check user portion for host separators.
###
###     Parameters:
###             $1 -- full recipient address
###
###     Returns:
###             parsed, non-local-relaying address
######################################################################

SParseRecipient
R$*                     $: <?> $>Parse0 $>3 $1
R<?> $* < @ $* . >      <?> $1 < @ $2 >         strip trailing dots
R<?> $- < @ $* >        $: <?> $(dequote $1 $) < @ $2 >         dequote local part

# if no $=O character, no host in the user portion, we are done
R<?> $* $=O $* < @ $* > $: <NO> $1 $2 $3 < @ $4>
R<?> $*                 $@ $1

ifdef(`_RELAY_ENTIRE_DOMAIN_', `dnl
# if we relay, check username portion for user%host so host can be checked also
R<NO> $* < @ $* $=m >   $: <RELAY> $1 < @ $2 $3 >', `dnl')
ifdef(`_RELAY_HOSTS_ONLY_',
`R<NO> $* < @ $=R >     $: <RELAY> $1 < @ $2 >
ifdef(`ACCESS_TABLE', `dnl
R<NO> $* < @ $* >       $: <$(access $2 $: NO $)> $1 < @ $2 >',`dnl')',
`R<NO> $* < @ $* $=R >  $: <RELAY> $1 < @ $2 $3 >
ifdef(`ACCESS_TABLE', `dnl
R<NO> $* < @ $* >       $: $>LookUpDomain <$2> <NO> <$1 < @ $2 >>
R<$+> <$+>              $: <$1> $2',`dnl')')
R<RELAY> $* < @ $* >    $@ $>ParseRecipient $1
R<$-> $*                $@ $2

######################################################################
###  check_relay -- check hostname/address on SMTP startup
######################################################################

SLocal_check_relay
Scheck_relay
R$*                     $: $1 $| $>"Local_check_relay" $1
R$* $| $* $| $#$*       $#$3
R$* $| $* $| $*         $@ $>"Basic_check_relay" $1 $| $2

SBasic_check_relay
# check for deferred delivery mode
R$*                     $: < ${deliveryMode} > $1
R< d > $*               $@ deferred
R< $* > $*              $: $2

ifdef(`ACCESS_TABLE', `dnl
R$+ $| $+               $: $>LookUpDomain < $1 > <?> < $2 >
R<?> < $+ >             $: $>LookUpAddress < $1 > <OK> < $1 >
R<OK> < $* >            $: $1
R<RELAY> < $* >         $: $1
R<REJECT> $*            $#error $@ 5.7.1 $: "ifdef(`confREJECT_MSG', `confREJECT_MSG', `550 Access denied')"
R<DISCARD> $*           $#discard $: discard
R<$+> $*                $#error $@ 5.7.1 $: $1', `dnl')

ifdef(`_RBL_', `dnl
# MAPS project checks -- http://maps.vix.com/
R$*                     $: $&{client_addr}
R$-.$-.$-.$-            $: $(host $4.$3.$2.$1._RBL_. $: OK $)
ROK                     $@ OK
R$+                     $#error $@ 5.7.1 $: "Mail from " $&{client_addr} " refused; see http://maps.vix.com/rbl/"',
`dnl')

######################################################################
###  check_mail -- check SMTP ``MAIL FROM:'' command argument
######################################################################

SLocal_check_mail
Scheck_mail
R$*                     $: $1 $| $>"Local_check_mail" $1
R$* $| $#$*             $#$2
R$* $| $*               $@ $>"Basic_check_mail" $1

SBasic_check_mail
# check for deferred delivery mode
R$*                     $: < ${deliveryMode} > $1
R< d > $*               $@ deferred
R< $* > $*              $: $2

R<>                     $@ <OK>
R$*                     $: <?> $>Parse0 $>3 $1          make domain canonical
R<?> $* < @ $+ . > $*   <?> $1 < @ $2 > $3              strip trailing dots
ifdef(`_ACCEPT_UNRESOLVABLE_DOMAINS_',
`R<?> $* < @ $+ > $*    $: <OK> $1 < @ $2 > $3          ... unresolvable OK',
`R<?> $* < @ $+ > $*    $: <? $(resolve $2 $: $2 <PERM> $) > $1 < @ $2 > $3
R<? $* <$->> $* < @ $+ > $*
                        $: <$2> $3 < @ $4 > $5')

ifdef(`_ACCEPT_UNQUALIFIED_SENDERS_',`dnl',`dnl
# handle case of @localhost on address
R<$+> $* < @localhost > $: < ? $&{client_name} > <$1> $2 < @localhost >
R<$+> $* < @localhost.$m >
                        $: < ? $&{client_name} > <$1> $2 < @localhost.$m >
ifdef(`_NO_UUCP_', `dnl',
`R<$+> $* < @localhost.UUCP >
                        $: < ? $&{client_name} > <$1> $2 < @localhost.UUCP >')
R<? $=w> <$+> $*        <?> <$2> $3
R<? $+> <$+> $*         $#error $@ 5.5.4 $: "553 Real domain name required"
R<?> <$+> $*            $: <$1> $2')

ifdef(`ACCESS_TABLE', `dnl
# lookup localpart (user@)
R<$+> $* < @ $+ > $*    $: <USER $(access $2@ $: ? $) > <$1> $2 < @ $3 > $4
# no match, try full address (user@domain rest)
R<USER ?> <$+> $* < @ $* > $*
                        $: <USER $(access $2@$3$4 $: ? $) > <$1> $2 < @ $3 > $4
# no match, try address (user@domain)
R<USER ?> <$+> $+ < @ $+ > $*
                        $: <USER $(access $2@$3 $: ? $) > <$1> $2 < @ $3 > $4
# no match, try (sub)domain (domain)
R<USER ?> <$+> $* < @ $+ > $*
                        $: $>LookUpDomain <$3> <$1> <>
# check unqualified user in access database
R<?> $*                 $: <USER $(access $1@ $: ? $) > <?> $1
# retransform for further use
R<USER $+> <$+> $*      $: <$1> $3',
`dnl')

ifdef(`_ACCEPT_UNQUALIFIED_SENDERS_',`dnl',`dnl
# handle case of no @domain on address
R<?> $*                 $: < ? $&{client_name} > $1
R<?> $*                 $@ <OK>                         ...local unqualed ok
R<? $+> $*              $#error $@ 5.5.4 $: "553 Domain name required"
                                                        ...remote is not')
# check results
R<?> $*                 $@ <OK>
R<OK> $*                $@ <OK>
R<TEMP> $*              $#error $@ 4.1.8 $: "451 Sender domain must resolve"
R<PERM> $*              $#error $@ 5.1.8 $: "501 Sender domain must exist"
ifdef(`ACCESS_TABLE', `dnl
R<RELAY> $*             $@ <RELAY>
R<DISCARD> $*           $#discard $: discard
R<REJECT> $*            $#error $@ 5.7.1 $: "ifdef(`confREJECT_MSG', `confREJECT_MSG', `550 Access denied')"
R<$+> $*                $#error $@ 5.7.1 $: $1          error from access db',
`dnl')

######################################################################
###  check_rcpt -- check SMTP ``RCPT TO:'' command argument
######################################################################

SLocal_check_rcpt
Scheck_rcpt
R$*                     $: $1 $| $>"Local_check_rcpt" $1
R$* $| $#$*             $#$2
R$* $| $*               $@ $>"Basic_check_rcpt" $1

SBasic_check_rcpt
# check for deferred delivery mode
R$*                     $: < ${deliveryMode} > $1
R< d > $*               $@ deferred
R< $* > $*              $: $2

ifdef(`_LOOSE_RELAY_CHECK_',`dnl
R$*                     $: $>Parse0 $>3 $1
R$* < @ $* . >          $1 < @ $2 >                     strip trailing dots',
`R$*                    $: $>ParseRecipient $1          strip relayable hosts')

ifdef(`_BLACKLIST_RCPT_',`dnl
ifdef(`ACCESS_TABLE', `dnl
# blacklist local users or any host from receiving mail
R$*                     $: <?> $1
R<?> $+ < @ $=w >       $: <> <USER $1> <FULL $1@$2> <HOST $2> <$1 < @ $2 >>
R<?> $+ < @ $* >        $: <> <FULL $1@$2> <HOST $2> <$1 < @ $2 >>
R<?> $+                 $: <> <USER $1> <$1>
R<> <USER $+> $*        $: <$(access $1 $: $)> $2
R<> <FULL $+> $*        $: <$(access $1 $: $)> $2
R<OK> <FULL $+> $*      $: <$(access $1 $: $)> $2
R<> <HOST $+> $*        $: <$(access $1 $: $)> $2
R<OK> <HOST $+> $*      $: <$(access $1 $: $)> $2
R<> <$*>                $: $1
R<OK> <$*>              $: $1
R<RELAY> <$*>           $: $1
R<REJECT> $*            $#error $@ 5.2.1 $: "550 Mailbox disabled for this recipient"
R<$+> $*                $#error $@ 5.2.1 $: $1                  error from access db', `dnl')', `dnl')

ifdef(`_PROMISCUOUS_RELAY_', `dnl', `dnl
# anything terminating locally is ok
ifdef(`_RELAY_ENTIRE_DOMAIN_', `dnl
R$+ < @ $* $=m >        $@ OK', `dnl')
R$+ < @ $=w >           $@ OK
ifdef(`_RELAY_HOSTS_ONLY_',
`R$+ < @ $=R >          $@ OK
ifdef(`ACCESS_TABLE', `dnl
R$+ < @ $* >            $: <$(access $2 $: ? $)> <$1 < @ $2 >>',`dnl')',
`R$+ < @ $* $=R >       $@ OK
ifdef(`ACCESS_TABLE', `dnl
R$+ < @ $* >            $: $>LookUpDomain <$2> <?> <$1 < @ $2 >>',`dnl')')
ifdef(`ACCESS_TABLE', `dnl
R<RELAY> $*             $@ RELAY
R<$*> <$*>              $: $2',`dnl')

ifdef(`_RELAY_MX_SERVED_', `dnl
# allow relaying for hosts which we MX serve
R$+ < @ $* >            $: < : $(mxserved $2 $) : > $1 < @ $2 >
R< : $* <TEMP> : > $*   $#error $@ 4.7.1 $: "450 Can not check MX records for recipient host " $1
R<$* : $=w . : $*> $*   $@ OK
R<$*> $*                        $: $2',
`dnl')

# local user
R$-                     $@ OK

# anything originating locally is ok
R$*                     $: $&{client_name}
# pass to name server to make hostname canonical
R$* $~P                 $: $[ $1 $2 $]
R$* .                   $1                              strip trailing dots
R$@                     $@ OK
ifdef(`_RELAY_ENTIRE_DOMAIN_', `dnl
R$* $=m                 $@ OK', `dnl')
R$=w                    $@ OK
ifdef(`_RELAY_HOSTS_ONLY_',
`R$=R                   $@ OK
ifdef(`ACCESS_TABLE', `dnl
R$*                     $: <$(access $1 $: ? $)> <$1>',`dnl')',
`R$* $=R                        $@ OK
ifdef(`ACCESS_TABLE', `dnl
R$*                     $: $>LookUpDomain <$1> <?> <$1>',`dnl')')
ifdef(`ACCESS_TABLE', `dnl
R<RELAY> $*             $@ RELAY
R<$*> <$*>              $: $2',`dnl')

# check IP address
R$*                     $: $&{client_addr}
R$@                     $@ OK                   originated locally
R$=R $*                 $@ OK                   relayable IP address
ifdef(`ACCESS_TABLE', `dnl
R$*                     $: $>LookUpAddress <$1> <?> <$1>
R<RELAY> $*             $@ RELAY                relayable IP address
R<$*> <$*>              $: $2', `dnl')
R$*                     $: [ $1 ]               put brackets around it...
R$=w                    $@ OK                   ... and see if it is local

ifdef(`_RELAY_LOCAL_FROM_', `dnl
# anything with a local FROM is ok
R$*                     $: $1 $| $>Parse0 $>3 $&f
R$* $| $+ < @ $=w . >   $@ OK                   FROM local
R$* $| $*               $: $1
', `dnl')

# anything else is bogus
R$*                     $#error $@ 5.7.1 $: "550 Relaying denied"')

undivert(9)dnl
#
######################################################################
######################################################################
#####
`#####                  MAILER DEFINITIONS'
#####
######################################################################
######################################################################
undivert(7)dnl
:         把 sendmail-8.9.0-bbs.mailer.m4 放在 sendmail-8.9.0/cf/mailer/bbs.m4
:         把 sendmail-8.9.0-bbs.proto.m4 放在 sendmail-8.9.0/cf/m4/proto.m4
:         然後進入 sendmail-8.9.0/cf/cf, 修改 xxxxx.mc, 加入 MAILER(bbs)
:         執行 m4 ../m4/cf.m4 xxxxx.mc > bbs.cf
:         然後再拿產生的 bbs.cf 去測試一下吧.

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