[ale] Clarification

jj at spiderentertainment.com jj at spiderentertainment.com
Wed Oct 20 13:18:43 EDT 1999


Also make sure that you have both MX for www.linux... and for linux...

Chris Fowler wrote:

> I have a site www.linuxiceberg.com that will accept mail to
>
> username at www.linuxiceberg.com but not username at linuxiceberg.com
>
> Below is email in queue:
> ----------------------------
> P210049
> I3/2/450162
> Mhost map: lookup (linuxiceberg.com): deferred
> Fb
> $_root at localhost
> Sroot
> RPFD:cfowler at linuxiceberg.com
> ---------------------------------
>
> There is an MX record below is DNS entry:
> ---------------------------------
> > linuxiceberg.com
> Server:  ns.cereus.com
> Address:  209.44.64.2
>
> linuxiceberg.com
>         origin = ns.cereus.com
>         mail addr = root.ns.cereus.com
>         serial = 1999102010
>         refresh = 10800 (3H)
>         retry   = 3600 (1H)
>         expire  = 604800 (1W)
>         minimum ttl = 86400 (1D)
> linuxiceberg.com        nameserver = ns.cereus.com
> linuxiceberg.com        preference = 30, mail exchanger = www.linuxiceberg.com
> linuxiceberg.com        nameserver = ns.cereus.com
> ns.cereus.com   internet address = 209.44.64.2
> www.linuxiceberg.com    internet address = 209.186.14.121
> ------------------------------------------------------
> Below is /etc/sendmail.cf
> ------------------------------------------------------
> ######################################################################
> ######################################################################
> #####
> #####           SENDMAIL CONFIGURATION FILE
> #####
> ##### built by root at porky.redhat.com on Mon Sep 21 20:54:22 EDT
> 1998
> ##### in /usr/src/bs/BUILD/sendmail-8.8.7/cf/cf
> ##### using ../ as configuration include directory
> #####
> ######################################################################
> ######################################################################
>
> #####  @(#)cfhead.m4    8.9 (Berkeley) 1/18/97  #####
> #####  @(#)cf.m4        8.24 (Berkeley) 8/16/95  #####
>
> #####  @(#)redirect.m4  8.5 (Berkeley) 8/17/96  #####
>
> #####  @(#)always_add_domain.m4 8.1 (Berkeley) 6/7/93  #####
>
> #####  @(#)use_cw_file.m4       8.1 (Berkeley) 6/7/93  #####
>
> #####  @(#)local_procmail.m4    8.6 (Berkeley) 10/20/96  #####
>
> #####  @(#)check_mail.m4        3.3 (Claus Assmann) 1997-08-05  #####
>
> #####  @(#)use_ip.m4    1.0 (Claus Assmann) 1996-11-23  #####
>
> #####  @(#)use_names.m4 1.0 (Claus Assmann) 1996-11-23  #####
>
> #####  @(#)use_relayto.m4       1.0 (Claus Assmann) 1996-11-23  #####
>
> #####  @(#)check_rcpt4.m4       2.4 (Claus Assmann) 1997-08-28  #####
>
> #####  @(#)check_relay.m4       3.0 (Claus Assmann) 1997-06-01  #####
>
> #####  @(#)proto.m4     8.151 (Berkeley) 7/31/97  #####
>
> # level 7 config file format
> V7/Berkeley
>
> ##################
> #   local info   #
> ##################
>
> Cwlocalhost
> # file containing names of hosts for which we receive email
> Fw/etc/sendmail.cw
>
> # my official domain name
> # ... define this only if sendmail cannot automatically determine
> your domain
> #Dj$w.linuxiceberg.com
>
> CP.
>
> # "Smart" relay host (may be null)
> DS
>
> # place to which unknown users should be forwarded
> #Kuser user -m -a<>
> #DLname_of_luser_relay
>
> # operators that cannot be in local usernames (i.e., network
> indicators)
> CO @ % !
>
> # a class with just dot (for identifying canonical names)
> C..
>
> # a class with just a left bracket (for identifying domain literals)
> C[[
>
> # Mailer table (overriding domains)
> #Kmailertable dbm /etc/mailertable
>
> # Domain table (adding domains)
> #Kdomaintable dbm /etc/domaintable
>
> # Generics table (mapping outgoing addresses)
> #Kgenerics dbm /etc/genericstable
>
> # Virtual user table (maps incoming users)
> #Kvirtuser dbm /etc/virtusertable
>
> # who I send unqualified names to (null means deliver locally)
> DR
>
> # who gets all local email traffic ($R has precedence for unqualified
> names)
> DH
>
> # dequoting map
> Kdequote dequote
>
> # class E: names that should be exposed as from this host, even
> if we masquerade
> # 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
>
> # who I masquerade as (null for no masquerading) (see also $=M)
> DM
>
> # my name for error messages
> DnMAILER-DAEMON
>
> CPREDIRECT
>
> # file containing full e-mail addresses of spammers (for check_mail):
> # spammer at address.domain "Error-Code Error-Text"
> # or junk domains (for check_mail, check_relay):
> # junk.domain  "Error-Code Error-Text"
> # or IP addresses (for check_relay):
> # D.X.Y.Z "Error-Code Error-Text"
> # C.X.Y "Error-Code Error-Text"
> # B.X "Error-Code Error-Text"
> # A "Error-Code Error-Text"
> Kjunk hash -a at JUNK /etc/mail/deny
>
> # file containing IP numbers of machines which can use our relay
> F{LocalIP} /etc/mail/ip_allow
>
> # file containing names of machines which can use our relay
> F{LocalNames} /etc/mail/name_allow
>
> # file containing names we relay to
> F{RelayTo} /etc/mail/relay_allow
>
> # Configuration version number
> DZ8.8.7
>
> ###############
> #   Options   #
> ###############
>
> # strip message body to 7 bits on input?
> O SevenBitInput=False
>
> # 8-bit data handling
> O EightBitMode=pass8
>
> # wait for alias file rebuild (default units: minutes)
> O AliasWait=10
>
> # location of alias file
> O AliasFile=/etc/aliases
>
> # minimum number of free blocks on filesystem
> O MinFreeBlocks=100
>
> # maximum message size
> #O MaxMessageSize=1000000
>
> # substitution for space (blank) characters
> O BlankSub=.
>
> # avoid connecting to "expensive" mailers on initial submission?
> O HoldExpensive=False
>
> # checkpoint queue runs after every N successful deliveries
> #O CheckpointInterval=10
>
> # default delivery mode
> O DeliveryMode=background
>
> # automatically rebuild the alias database?
> #O AutoRebuildAliases
>
> # error message header/file
> #O ErrorHeader=/etc/sendmail.oE
>
> # error mode
> #O ErrorMode=print
>
> # save Unix-style "From_" lines at top of header?
> #O SaveFromLine
>
> # temporary file mode
> O TempFileMode=0600
>
> # match recipients against GECOS field?
> #O MatchGECOS
>
> # maximum hop count
> #O MaxHopCount=17
>
> # location of help file
> O HelpFile=/usr/lib/sendmail.hf
>
> # ignore dots as terminators in incoming messages?
> #O IgnoreDots
>
> # name resolver options
> #O ResolverOptions=+AAONLY
>
> # deliver MIME-encapsulated error messages?
> O SendMimeErrors=True
>
> # Forward file search path
> O ForwardPath=$z/.forward.$w:$z/.forward
>
> # open connection cache size
> O ConnectionCacheSize=2
>
> # open connection cache timeout
> O ConnectionCacheTimeout=5m
>
> # persistent host status directory
> #O HostStatusDirectory=.hoststat
>
> # single thread deliveries (requires HostStatusDirectory)?
> #O SingleThreadDelivery
>
> # use Errors-To: header?
> O UseErrorsTo=False
>
> # log level
> O LogLevel=9
>
> # send to me too, even in an alias expansion?
> #O MeToo
>
> # verify RHS in newaliases?
> O CheckAliases=False
>
> # default messages to old style headers if no special punctuation?
> O OldStyleHeaders=True
>
> # SMTP daemon options
> #O DaemonPortOptions=Port=esmtp
>
> # privacy flags
> O PrivacyOptions=authwarnings
>
> # who (if anyone) should get extra copies of error messages
> #O PostMasterCopy=Postmaster
>
> # slope of queue-only function
> #O QueueFactor=600000
>
> # queue directory
> O QueueDirectory=/var/spool/mqueue
>
> # timeouts (many of these)
> #O Timeout.initial=5m
> #O Timeout.connect=5m
> #O Timeout.iconnect=5m
> #O Timeout.helo=5m
> #O Timeout.mail=10m
> #O Timeout.rcpt=1h
> #O Timeout.datainit=5m
> #O Timeout.datablock=1h
> #O Timeout.datafinal=1h
> #O Timeout.rset=5m
> #O Timeout.quit=2m
> #O Timeout.misc=2m
> #O Timeout.command=1h
> #O Timeout.ident=30s
> #O Timeout.fileopen=60s
> O Timeout.queuereturn=5d
> #O Timeout.queuereturn.normal=5d
> #O Timeout.queuereturn.urgent=2d
> #O Timeout.queuereturn.non-urgent=7d
> O Timeout.queuewarn=4h
> #O Timeout.queuewarn.normal=4h
> #O Timeout.queuewarn.urgent=1h
> #O Timeout.queuewarn.non-urgent=12h
> #O Timeout.hoststatus=30m
>
> # should we not prune routes in route-addr syntax addresses?
> #O DontPruneRoutes
>
> # queue up everything before forking?
> O SuperSafe=True
>
> # status file
> O StatusFile=/var/log/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
> #O TimeZoneSpec=
>
> # default UID (can be username or userid:groupid)
> O DefaultUser=8:12
>
> # list of locations of user database file (null means no lookup)
> #O UserDatabaseSpec=/etc/userdb
>
> # fallback MX host
> #O FallbackMXhost=fall.back.host.net
>
> # if we are the best MX host for a site, try it directly instead
> of config err
> #O TryNullMXList
>
> # load average at which we just queue messages
> #O QueueLA=8
>
> # load average at which we refuse connections
> #O RefuseLA=12
>
> # maximum number of children we allow at one time
> #O MaxDaemonChildren=12
>
> # maximum number of new connections per second
> #O ConnectionRateThrottle=3
>
> # work recipient factor
> #O RecipientFactor=30000
>
> # deliver each queued job in a separate process?
> #O ForkEachJob
>
> # work class factor
> #O ClassFactor=1800
>
> # work time factor
> #O RetryFactor=90000
>
> # shall we sort the queue by hostname first?
> #O QueueSortOrder=priority
>
> # minimum time in queue before retry
> #O MinQueueAge=30m
>
> # default character set
> #O DefaultCharSet=iso-8859-1
>
> # service switch file (ignored on Solaris, Ultrix, OSF/1, others)
> #O ServiceSwitchFile=/etc/service.switch
>
> # hosts file (normally /etc/hosts)
> #O HostsFile=/etc/hosts
>
> # dialup line delay on connection failure
> #O DialDelay=10s
>
> # action to take if there are no recipients in the message
> #O NoRecipientAction=add-to-undisclosed
>
> # chrooted environment for writing to files
> #O SafeFileEnvironment=/arch
>
> # are colons OK in addresses?
> #O ColonOkInAddr
>
> # how many jobs can you process in the queue?
> #O MaxQueueRunSize=10000
>
> # shall I avoid expanding CNAMEs (violates protocols)?
> #O DontExpandCnames
>
> # SMTP initial login message (old $e macro)
> O SmtpGreetingMessage=$j Sendmail $v/$Z; $b
>
> # UNIX initial From header format (old $l macro)
> O UnixFromLine=From $g  $d
>
> # delimiter (operator) characters (old $o macro)
> O OperatorChars=.:%@!^/[]+
>
> # shall I avoid calling initgroups(3) because of high NIS costs?
> #O DontInitGroups
>
> # are group-writable :include: and .forward files (un)trustworthy?
> #O UnsafeGroupWrites
>
> # where do errors that occur when sending errors get sent?
> #O DoubleBounceAddress
>
> # what user id do we assume for the majority of the processing?
> #O RunAsUser=sendmail
>
> ###########################
> #   Message precedences   #
> ###########################
>
> Pfirst-class=0
> Pspecial-delivery=100
> Plist=-30
> Pbulk=-60
> Pjunk=-100
>
> #####################
> #   Trusted users   #
> #####################
>
> # this is equivalent to setting class "t"
> #Ft/etc/sendmail.ct
> Troot
> Tdaemon
> Tuucp
>
> #########################
> #   Format of headers   #
> #########################
>
> H?P?Return-Path: <$g>
> HReceived: $?sfrom $s $.$?_($?s$|from $.$_)
>         $.by $j ($v/$Z)$?r with $r$. id $i$?u
>         for $u; $|;
>         $.$b
> H?D?Resent-Date: $a
> H?D?Date: $a
> H?F?Resent-From: $?x$x <$g>$|$g$.
> H?F?From: $?x$x <$g>$|$g$.
> 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@$j>
> #
>
> ######################################################################
> ######################################################################
> #####
> #####                   REWRITING RULES
> #####
> ######################################################################
> ######################################################################
>
> ############################################
> ###  Ruleset 3 -- Name Canonicalization  ###
> ############################################
> S3
>
> # handle null input (translate to <@> special case)
> R$@                     $@ <@>
>
> # strip group: syntax (not inside angle brackets!) and trailing
> semicolon
> R$*                     $: $1 <@>                       mark addresses
> R$* < $* > $* <@>       $: $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, at b, at c:user at 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 > $4               nix colons in addrs
>
> # convert old-style addresses to a domain-based address
> R$- ! $+                $@ $>96 $2 < @ $1 .UUCP >       resolve uucp names
> R$+ . $- ! $+           $@ $>96 $3 < @ $1 . $2 >                domain uucps
> R$+ ! $+                $@ $>96 $2 < @ $1 .UUCP >       uucp subdomains
>
> # if we have % signs, take the rightmost one
> R$* % $*                $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 . > $2             local domain
> R$* < @ 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 > $3               canon IP addr
>
> # look up domains in the domain table
> #R$* < @ $+ > $*                $: $1 < @ $(domaintable $2 $) > $3
>
> # if really UUCP, handle it immediately
>
> # try UUCP traffic as a local address
> R$* < @ $+ . UUCP > $*          $: $1 < @ $[ $2 $] . UUCP . > $3
> R$* < @ $+ . . UUCP . > $*              $@ $1 < @ $2 . > $3
>
> # pass to name server to make hostname canonical
> R$* < @ $* $~P > $*             $: $1 < @ $[ $2 $3 $] > $4
>
> # local host aliases and pseudo-domains are always canonical
> R$* < @ $=w > $*                $: $1 < @ $2 . > $3
> R$* < @ $j > $*                 $: $1 < @ $j . > $2
> R$* < @ $=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@ $*                   $@ @ $1                         ... and exit
>
> # UUCP must always be presented in old form
> R$+ @ $- . UUCP         $2!$1                           u at h.UUCP => h!u
>
> # delete duplicate local names
> R$+ % $=w @ $=w         $1 @ $2                         u%host at host => u at host
>
> ##############################################################
> ###   Ruleset 97 -- recanonicalize and call ruleset zero   ###
> ###                (used for recursive calls)              ###
> ##############################################################
>
> S97
> R$*                     $: $>3 $1
> R$*                     $@ $>0 $1
>
> ######################################
> ###   Ruleset 0 -- Parse Address   ###
> ######################################
>
> S0
>
> R$*                     $: $>Parse0 $1          initial parsing
> R$*                     $: $>98 $1              handle local hacks
> R$*                     $: $>Parse1 $1          final parsing
>
> SParse0
> R<@>                    $#local $: <@>          special case error msgs
> R$* : $* ; <@>          $#error $@ 5.1.3 $: "list:; syntax illegal for
> recipient addresses"
> R<@ $+>                 $#error $@ 5.1.1 $: "user address required"
> R$*                     $: <> $1
> R<> $* < @ [ $+ ] > $*  $1 < @ [ $2 ] > $3
> R<> $* <$* : $* > $*    $#error $@ 5.1.1 $: "colon illegal in host
> name part"
> R<> $*                  $1
> R$* < @ . $* > $*       $#error $@ 5.1.2 $: "invalid host name"
> R$* < @ $* .. $* > $*   $#error $@ 5.1.2 $: "invalid host name"
>
> # handle numeric address spec
> R$* < @ [ $+ ] > $*     $: $>98 $1 < @ [ $2 ] > $3      numeric internet
> spec
> R$* < @ [ $+ ] > $*     $#esmtp $@ [$2] $: $1 < @ [$2] > $3     still
> numeric: send
>
> # 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 $@ 5.1.1 $: "user address required"
> R$* $=O $* < @ $=w . >  $@ $>Parse0 $>3 $1 $2 $3        ... at here -> ...
>
> SParse1
> # handle virtual users
> #R$+ < @ $=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 $1
>
> # short circuit local delivery so forwarded email works
> #R$+ . USENET < @ $=w . >       $#usenet $: $1          handle usenet specially
> R$=L < @ $=w . >        $#local $: @ $1         special local names
> R$+ < @ $=w . >         $#local $: $1                   regular local name
>
> # not local -- try mailer table lookup
> #R$* <@ $+ > $*         $: < $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> $2                 try domain
>
> # resolve remotely connected UUCP links (if any)
>
> # resolve fake top level domains by forwarding to other hosts
>
> # pass names that still have a host to a smarthost (if defined)
> R$* < @ $* > $*         $: $>95 < $S > $1 < @ $2 > $3   glue on smarthost
> name
>
> # deal with other remote names
> R$* < @$* > $*          $#esmtp $@ $2 $: $1 < @ $2 > $3         user at host.domain
>
> # if this is quoted, strip the quotes and try again
> R$+                     $: $(dequote $1 $)              strip quotes
> R$+ $=O $+              $@ $>97 $1 $2 $3                        try again
>
> # handle locally delivered names
> R$=L                    $#local $: @ $1                 special local names
> R$+                     $#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
>
> # 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
>
> # see if we have a relay or a hub
> R< > $+                 $: < $H > $1                    try hub
> R< > $+                 $: < $R > $1                    try relay
> R< > $+                 $: < > < $1 $(dequote "" $&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 $(dequote "" $&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 < @ $1 >
>
> ###################################################################
> ###  Ruleset 90 -- try domain part of mailertable entry         ###
> ###################################################################
>
> S90
> #R$* <$- . $+ > $*      $: $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
>
> ###################################################################
> ###  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 at host syntax -- ignore host part
> R< $+ @ $+ > $* < @ $* >        $: < $1 > $3 < @ $4 >
>
> # handle local:user syntax
> R< $+ > $* <@ $* > $*           $#local $@ $2@$3 $: $1
> R< $+ > $*                      $#local $@ $2    $: $1
>
> ###################################################################
> ###  Ruleset 93 -- convert header names to masqueraded form     ###
> ###################################################################
>
> S93
>
> # handle generics database
> #R$+ < @ $=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< > $*                        $: $1                           not found
>
> # special case the users that should be exposed
> R$=E < @ *LOCAL* >      $@ $1 < @ $j . >                leave exposed
> R$=E < @ $=M . >        $@ $1 < @ $2 . >
> R$=E < @ $=w . >        $@ $1 < @ $2 . >
>
> # handle domain-specific masquerading
> R$* < @ $=M . > $*      $: $1 < @ $2 . @ $M > $3        convert masqueraded
> doms
> R$* < @ $=w . > $*      $: $1 < @ $2 . @ $M > $3
> R$* < @ *LOCAL* > $*    $: $1 < @ $j . @ $M > $2
> R$* < @ $+ @ > $*       $: $1 < @ $2 > $3               $M is null
> R$* < @ $+ @ $+ > $*    $: $1 < @ $3 . > $4             $M is not null
>
> ###################################################################
> ###  Ruleset 94 -- convert envelope names to masqueraded form   ###
> ###################################################################
>
> S94
> #R$+                    $@ $>93 $1
> R$* < @ *LOCAL* > $*    $: $1 < @ $j . > $2
>
> ###################################################################
> ###  Ruleset 98 -- local part of ruleset zero (can be null)     ###
> ###################################################################
>
> S98
>
> # addresses sent to foo at host.REDIRECT will give a 551 error code
> R$* < @ $+ .REDIRECT. >         $: $1 < @ $2 . REDIRECT . > < ${opMode}
> >
> R$* < @ $+ .REDIRECT. > <i>     $: $1 < @ $2 . REDIRECT. >
> R$* < @ $+ .REDIRECT. > < $- >  $# error $@ 5.1.1 $: "551 User
> has moved; please try " <$1@$2>
>
> # check for junk domain/spammers
> Sjunk
> # lookup domain in database
> R$*<@$+>                $:$1<@$(junk $2$)>
> # exists? return
> R$*<@$*@JUNK>           $@$1<@$2 at JUNK>
> # lookup address in database
> R$*<@$+>                $:$1<@$(junk $1@$2 $:$2$)>
> # exists? return
> R$*<@$*@JUNK>           $@$1<@$2 at JUNK>
> # remove one subdomain, try again
> R$*<@$-.$-.$+>          $: $>junk $1<@$3.$4>
>
> Scheck_mail
> # don't check these
> R<$*@$=w>       $@ ok                   shortcut
> # idea from Steven Schultz
> R<>             $: <$n @ $(dequote "" $&{client_name} $) >
>
> # remove at least the dot...
> R<$*@$*.>       <$1@$2>
> R$*             $: $>3 $1                       canonify
> R$-             $@ ok
> # no host without a . in the FQHN ?
> R$*<@$->$*      $#error $@ 5.1.8 $: 551 invalid host name $2, check
> your configuration.
> # lookup IP address (reverse mapping available?)
> #R$*<@[$-.$-.$-.$-]>$*  $: $1 < @ $[ [ $2.$3.$4.$5 ] $] > $6
> # copy the result of the lookup
> R$*             $:$1 $| $1
> # now remove the dot
> R$* $| $*<@$*.>$*       $: $1 $| $2<@$3>$4
> # and check the database
> R$* $| $*<@$*>$*        $: $1 $| $>junk $2<@$3>
> # match: return given error code (rhs of map)
> R$* $| $*<@$*@JUNK>$*   $#error $@ 5.7.1 $: $3
> # restore original value (after canonicalization by ruleset 3)
> R$* $| $*               $: $1
> # this is dangerous! no real name
> # (see RFC 1123,sections 5.2.2 and 5.2.18)
> #R$*<@$*$~P>$*  $#error $@ 4.1.8 $: 451 unresolvable host name
> $2$3, check your setup.
>
> Scheck_rcpt
> # first: get client address
> R$+                     $: $(dequote "" $&{client_addr} $) $| $1
> R0 $| $*                $@ ok           client_addr is 0 for sendmail -bs
> R$={LocalIP}$* $| $*    $@ ok           from here
> # next: get client name
> R$* $| $+               $: $(dequote "" $&{client_name} $) $| $2
> R $| $*                 $@ ok           no client name: directly invoked
> #R$- $| $*              $@ ok           for those without full DNS...
> R$*$=w $| $*            $@ ok           from here
> R$*$={LocalNames} $| $* $@ ok           from allowed system
> # now check other side
> R$* $| $*               $: $>3 $2
> # remove local part
> R$*<@$+.>$*             $: $>remove_local $1<@$2.>$3
> # still something left?
> R$*<@$+>$*              $#error $@ 5.7.1 $: 551 we do not relay
>
> Sremove_local
> # remove RelayTo part (maybe repeatedly)
> R$*<@$*$={RelayTo}.>$*          $>3 $1 $4
> R$*<@$=w.>$*                    $: $>remove_local $>3 $1 $3
>
> SjunkIP
> # lookup IP in database
> # full IP address
> R$-.$-.$-.$-    $: $(junk $1.$2.$3.$4 $)
> # class C net
> R$-.$-.$-.$-    $: $(junk $1.$2.$3 $: $1.$2.$3.$4 $)
> # class B net
> R$-.$-.$-.$-    $: $(junk $1.$2 $: $1.$2.$3.$4 $)
> # class A net
> R$-.$-.$-.$-    $: $(junk $1 $: $1.$2.$3.$4 $)
>
> Scheck_relay
> # check IP
> R$+ $| $+       $: $1 $| $>junkIP $2
> R$+ $| $*@JUNK  $#error $@ 5.7.1 $: $2
> # check hostname
> R$+ $| $+       $: $>junk <@$1>
> R$*<@$*@JUNK>$* $#error $@ 5.7.1 $: $2
> #
>
> ######################################################################
> ######################################################################
> #####
> #####                   MAILER DEFINITIONS
>
> #####
> ######################################################################
> ######################################################################
>
> ######################*****##############
> ###   PROCMAIL Mailer specification   ###
> ##################*****##################
>
> #####  @(#)procmail.m4  8.6 (Berkeley) 4/30/97  #####
>
> Mprocmail,      P=/usr/bin/procmail, F=DFMSPhnu9, S=11/31, R=21/31,
> T=DNS/RFC822/X-Unix,
>                 A=procmail -Y -m $h $f $u
>
> #####################################
> ###   SMTP Mailer specification   ###
> #####################################
>
> #####  @(#)smtp.m4      8.33 (Berkeley) 7/9/96  #####
>
> Msmtp,          P=[IPC], F=mDFMuX, S=11/31, R=21, E=\r\n, L=990,
>                 T=DNS/RFC822/SMTP,
>                 A=IPC $h
> Mesmtp,         P=[IPC], F=mDFMuXa, S=11/31, R=21, E=\r\n, L=990,
>                 T=DNS/RFC822/SMTP,
>                 A=IPC $h
> Msmtp8,         P=[IPC], F=mDFMuX8, S=11/31, R=21, E=\r\n, L=990,
>                 T=DNS/RFC822/SMTP,
>                 A=IPC $h
> Mrelay,         P=[IPC], F=mDFMuXa8, S=11/31, R=61, E=\r\n, L=2040,
>                 T=DNS/RFC822/SMTP,
>                 A=IPC $h
>
> #
> #  envelope sender rewriting
> #
> S11
> R$+                     $: $>51 $1                      sender/recipient common
> R$* :; <@>              $@                              list:; special case
> R$*                     $: $>61 $1                      qualify unqual'ed names
> R$+                     $: $>94 $1                      do masquerading
>
> #
> #  envelope recipient rewriting --
> #  also header recipient if not masquerading recipients
> #
> S21
> R$+                     $: $>51 $1                      sender/recipient common
> R$+                     $: $>61 $1                      qualify unqual'ed names
>
> #
> #  header sender and masquerading header recipient rewriting
> #
> S31
> R$+                     $: $>51 $1                      sender/recipient common
> R:; <@>                 $@                              list:; special case
>
> # do special header rewriting
> R$* <@> $*              $@ $1 <@> $2                    pass null host through
> R< @ $* > $*            $@ < @ $1 > $2                  pass route-addr through
> R$*                     $: $>61 $1                      qualify unqual'ed names
> R$+                     $: $>93 $1                      do masquerading
>
> #
> #  convert pseudo-domain addresses to real domain addresses
> #
> S51
>
> # pass <route-addr>s through
> R< @ $+ > $*            $@ < @ $1 > $2                  resolve <route-addr>
>
> # output fake domains as user%fake at relay
>
> # do UUCP heuristics; note that these are shared with UUCP mailers
> R$+ < @ $+ .UUCP. >     $: < $2 ! > $1                  convert to UUCP form
> R$+ < @ $* > $*         $@ $1 < @ $2 > $3               not UUCP form
>
> # leave these in .UUCP form to avoid further tampering
> R< $&h ! > $- ! $+      $@ $2 < @ $1 .UUCP. >
> R< $&h ! > $-.$+ ! $+   $@ $3 < @ $1.$2 >
> R< $&h ! > $+           $@ $1 < @ $&h .UUCP. >
> R< $+ ! > $+            $: $1 ! $2 < @ $Y >             use UUCP_RELAY
> R$+ < @ $+ : $+ >       $@ $1 < @ $3 >                  strip mailer: part
> R$+ < @ >               $: $1 < @ *LOCAL* >             if no UUCP_RELAY
>
> #
> #  common sender and masquerading recipient rewriting
> #
> S61
>
> R$* < @ $* > $*         $@ $1 < @ $2 > $3               already fully qualified
> R$+                     $@ $1 < @ *LOCAL* >             add local qualification
>
> #
> #  relay mailer header masquerading recipient rewriting
> #
> S71
>
> R$+                     $: $>61 $1
> R$+                     $: $>93 $1
>
> ##################################################
> ###   Local and Program Mailer specification   ###
> ##################################################
>
> #####  @(#)local.m4     8.23 (Berkeley) 5/31/96  #####
>
> Mlocal,         P=/usr/bin/procmail, F=lsDFMAw5:/|@qSPfhn9, S=10/30,
> R=20/40,
>                 T=DNS/RFC822/X-Unix,
>                 A=procmail -Y -a $h -d $u
> Mprog,          P=/bin/sh, F=lsDFMoqeu9, S=10/30, R=20/40, D=$z:/,
>                 T=X-Unix,
>                 A=sh -c $u
>
> #
> #  Envelope sender rewriting
> #
> S10
> R<@>                    $n                      errors to mail






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