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divert(-1)
#
# Copyright (c) 1983, 1995 Eric P. Allman
# Copyright (c) 1988, 1993
# The Regents of the University of California. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by the University of
# California, Berkeley and its contributors.
# 4. Neither the name of the University nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
divert(0)
VERSIONID(`@(#)nullrelay.m4 8.12 (Berkeley) 10/12/96')
#
# This configuration applies only to relay-only hosts. They send
# all mail to a hub without consideration of the address syntax
# or semantics, except for adding the hub qualification to the
# addresses.
#
# This is based on a prototype done by Bryan Costales of ICSI.
#
######################################################################
######################################################################
#####
##### REWRITING RULES
#####
######################################################################
######################################################################
###########################################
### Rulset 3 -- Name Canonicalization ###
###########################################
S3
# handle null input
R$@ $@ <@>
# strip group: syntax (not inside angle brackets!) and trailing semicolon
R$* $: $1 <@> mark addresses
R$* < $* > $* <@> $: $1 < $2 > $3 unmark <addr>
R$* :: $* <@> $: $1 :: $2 unmark node::addr
R:`include': $* <@> $: :`include': $1 unmark :`include':...
R$* : $* <@> $: $2 strip colon if marked
R$* <@> $: $1 unmark
R$* ; $: $1 strip trailing semi
# null input now results from list:; syntax
R$@ $@ :; <@>
# basic textual canonicalization -- note RFC733 heuristic here
R$* $: < $1 > housekeeping <>
R$+ < $* > < $2 > strip excess on left
R< $* > $+ < $1 > strip excess on right
R<> $@ < @ > MAIL FROM:<> case
R< $+ > $: $1 remove housekeeping <>
ifdef(`_NO_CANONIFY_', `dnl',
`# eliminate local host if present
R@ $=w $=: $+ $@ @ $M $2 $3 @thishost ...
R@ $+ $@ @ $1 @somewhere ...
R$=E @ $=w $@ $1 @ $2 leave exposed
R$+ @ $=w $@ $1 @ $M ...@thishost
R$+ @ $+ $@ $1 @ $2 ...@somewhere
R$=w ! $=E $@ $2 @ $1 leave exposed
R$=w ! $+ $@ $2 @ $M thishost!...
R$+ ! $+ $@ $1 ! $2 @ $M somewhere ! ...
R$=E % $=w $@ $1 @ $2 leave exposed
R$+ % $=w $@ $1 @ $M ...%thishost
R$+ % $+ $@ $1 @ $2 ...%somewhere
R$=E $@ $1 @ $j leave exposed
R$+ $@ $1 @ $M unadorned user')
######################################
### Ruleset 0 -- Parse Address ###
######################################
S0
R$*:;<@> $#error $@ USAGE $: "list:; syntax illegal for recipient addresses"
# pass everything else to a relay host
R$* $#_RELAY_ $@ $H $: $1
##################################################
### Ruleset 4 -- Final Output Post-rewriting ###
##################################################
S4
R$* <@> $@ handle <> and list:;
# strip trailing dot off before passing to nullclient relay
R$* @ $+ . $1 @ $2
#
######################################################################
######################################################################
#####
`##### MAILER DEFINITIONS'
#####
######################################################################
######################################################################
undivert(7)dnl
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