/usr/share/doc/procmail/examples/local_procmail_lmtp.m4 is in procmail 3.22-25+deb9u1.
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# Copyright 2001, Philip Guenther, The United States of America
#
# This file should be copied to the cf/feature directory of the
# sendmail distribution. The following blurb is roughly what would
# go in the list of FEATURES in the cf/README file:
#
# `local_procmail_lmtp
# Use procmail as an LMTP capable local mailer. By using
# LMTP for the connection between sendmail and procmail,
# delivery to multiple recipients can be performed more
# efficiently while still allowing a separate status code
# for each recipient. With this feature, the local mailer
# can make use of the "user+indicator@local.host" syntax;
# normally the +indicator is just tossed, but by default
# it is passed as the -a argument to procmail.
#
# This feature can take up to three arguments:
# 1. Path to the mailer program
# [default: PROCMAIL_MAILER_PATH or /usr/local/bin/procmail]
# 2. Argument vector including name of the program
# [default: procmail -Y -a $h -z]
# 3. Flags for the mailer [default: PSXhmnz9]
#
# Empty arguments cause the defaults to be taken.
# WARNING: This feature sets LOCAL_MAILER_FLAGS unconditionally,
# i.e., without respecting any definitions in an OSTYPE setting.'
#
# This feature would probably be better implemented on top of the
# local_lmtp or local_procmail features that are currently distributed,
# but the following is known to work with Sendmail 8.11
divert(0)
VERSIONID(`$Id: local_procmail_lmtp.m4,v 1.3 2001/09/11 04:45:48 guenther Exp $')
divert(-1)
define(`LOCAL_MAILER_PATH',
ifelse(defn(`_ARG_'), `',
ifdef(`PROCMAIL_MAILER_PATH',
PROCMAIL_MAILER_PATH,
`/usr/local/bin/procmail'),
_ARG_))
define(`LOCAL_MAILER_ARGS',
ifelse(len(X`'_ARG2_), `1', `procmail -Y -a $h -z', _ARG2_))
define(`LOCAL_MAILER_FLAGS',
ifelse(len(X`'_ARG3_), `1', `PSXhmnz9', _ARG3_))
define(`LOCAL_MAILER_DSN_DIAGNOSTIC_CODE', `SMTP')
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