divert(-1)

#

# Copyright (c) 1998-2000 Sendmail, Inc. and its suppliers.

# All rights reserved.

# Copyright (c) 1983 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.

#

#ident "%Z%%M% %I% %E% SMI"

#

divert(0)

VERSIONID(`$Id: bestmx_is_local.m4,v 8.26 2000/09/17 17:30:00 gshapiro Exp $')

divert(-1)

define(`_BESTMX_IS_LOCAL_', _ARG_)

LOCAL_CONFIG

# turn on bestMX lookup table

Kbestmx bestmx

ifelse(defn(`_ARG_'), `', `dnl',`

# limit bestmx to these domains

CB`'_ARG_')

LOCAL_NET_CONFIG

# If we are the best MX for a site, then we want to accept

# its mail as local. We assume we've already weeded out mail to

# UUCP sites which are connected to us, which should also have

# listed us as their best MX.

#

# Warning: this may generate a lot of extra DNS traffic -- a

# lower cost method is to list all the expected best MX hosts

# in $=w. This should be fine (and easier to administer) for

# low to medium traffic hosts. If you use the limited bestmx

# by passing in a set of possible domains it will improve things.

ifelse(defn(`_ARG_'), `', `dnl

# unlimited bestmx

R$* < @ $* > $* $: $1 < @ $2 @@ $(bestmx $2 $) > $3',

`dnl

# limit bestmx to $=B

R$* < @ $* $=B . > $* $: $1 < @ $2 $3 . @@ $(bestmx $2 $3 . $) > $4')

R$* $=O $* < @ $* @@ $=w . > $* $@ $>Recurse $1 $2 $3

R< @ $* @@ $=w . > : $* $@ $>Recurse $3

dnl we cannot use _LOCAL_ here since it is defined too late

R$* < @ $* @@ $=w . > $* $@ $>CanonLocal < $1 >

R$* < @ $* @@ $* > $* $: $1 < @ $2 > $4