/usr/share/sendmail/cf/mailer/uucp.m4 is in sendmail-cf 8.15.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 1998-2001 Proofpoint, 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.
#
#
ifdef(`UUCP_MAILER_PATH',, `define(`UUCP_MAILER_PATH', /usr/bin/uux)')
ifdef(`UUCP_MAILER_ARGS',, `define(`UUCP_MAILER_ARGS', `uux - -r -a$g -gC $h!rmail ($u)')')
_DEFIFNOT(`UUCP_MAILER_FLAGS', `')
ifdef(`UUCP_MAILER_MAX',,
`define(`UUCP_MAILER_MAX',
`ifdef(`UUCP_MAX_SIZE', `UUCP_MAX_SIZE', 100000)')')
define(`_UUCP_QGRP', `ifelse(defn(`UUCP_MAILER_QGRP'),`',`', ` Q=UUCP_MAILER_QGRP,')')dnl
POPDIVERT
#####################################
### UUCP Mailer specification ###
#####################################
VERSIONID(`$Id: uucp.m4,v 8.45 2013-11-22 20:51:14 ca Exp $')
#
# envelope and header sender rewriting
#
SFromU
# handle error address as a special case
R<@> $n errors to mailer-daemon
# list:; syntax should disappear
R:; <@> $@
R$* < @ $* . > $* $1 < @ $2 > $3 strip trailing dots
R$* < @ $=w > $1 strip local name
R<@ $- . UUCP > : $+ $1 ! $2 convert to UUCP format
R<@ $+ > : $+ $1 ! $2 convert to UUCP format
R$* < @ $- . UUCP > $2 ! $1 convert to UUCP format
R$* < @ $+ > $2 ! $1 convert to UUCP format
R$&h ! $+ ! $+ $@ $1 ! $2 $h!...!user => ...!user
R$&h ! $+ $@ $&h ! $1 $h!user => $h!user
R$+ $: $U ! $1 prepend our name
R! $+ $: $k ! $1 in case $U undefined
#
# envelope recipient rewriting
#
SEnvToU
# list:; should disappear
R:; <@> $@
R$* < @ $* . > $* $1 < @ $2 > $3 strip trailing dots
R$* < @ $=w > $1 strip local name
R<@ $- . UUCP > : $+ $1 ! $2 convert to UUCP format
R<@ $+ > : $+ $1 ! $2 convert to UUCP format
R$* < @ $- . UUCP > $2 ! $1 convert to UUCP format
R$* < @ $+ > $2 ! $1 convert to UUCP format
#
# header recipient rewriting
#
SHdrToU
# list:; syntax should disappear
R:; <@> $@
R$* < @ $* . > $* $1 < @ $2 > $3 strip trailing dots
R$* < @ $=w > $1 strip local name
R<@ $- . UUCP > : $+ $1 ! $2 convert to UUCP format
R<@ $+ > : $+ $1 ! $2 convert to UUCP format
R$* < @ $- . UUCP > $2 ! $1 convert to UUCP format
R$* < @ $+ > $2 ! $1 convert to UUCP format
R$&h ! $+ ! $+ $@ $1 ! $2 $h!...!user => ...!user
R$&h ! $+ $@ $&h ! $1 $h!user => $h!user
R$+ $: $U ! $1 prepend our name
R! $+ $: $k ! $1 in case $U undefined
ifdef(`_MAILER_smtp_',
`#
# envelope sender rewriting for uucp-dom mailer
#
SEnvFromUD
# handle error address as a special case
R<@> $n errors to mailer-daemon
# pass everything to standard SMTP mailer rewriting
R$* $@ $>EnvFromSMTP $1
#
# envelope sender rewriting for uucp-uudom mailer
#
SEnvFromUUD
# handle error address as a special case
R<@> $n errors to mailer-daemon
# do standard SMTP mailer rewriting
R$* $: $>EnvFromSMTP $1
R$* < @ $* . > $* $1 < @ $2 > $3 strip trailing dots
R<@ $- . UUCP > : $+ $@ $1 ! $2 convert to UUCP format
R<@ $+ > : $+ $@ $1 ! $2 convert to UUCP format
R$* < @ $- . UUCP > $@ $2 ! $1 convert to UUCP format
R$* < @ $+ > $@ $2 ! $1 convert to UUCP format',
`errprint(`*** MAILER(`smtp') must appear before MAILER(`uucp')
if uucp-dom should be included.')
')
PUSHDIVERT(4)
# resolve locally connected UUCP links
R$* < @ $=Z . UUCP. > $* $#uucp-uudom $@ $2 $: $1 < @ $2 .UUCP. > $3
R$* < @ $=Y . UUCP. > $* $#uucp-new $@ $2 $: $1 < @ $2 .UUCP. > $3
R$* < @ $=U . UUCP. > $* $#uucp-old $@ $2 $: $1 < @ $2 .UUCP. > $3
POPDIVERT
#
# There are innumerable variations on the UUCP mailer. It really
# is rather absurd.
#
# old UUCP mailer (two names)
Muucp, P=UUCP_MAILER_PATH, F=_MODMF_(CONCAT(`DFMhuUd', UUCP_MAILER_FLAGS), `UUCP'), S=FromU, R=EnvToU/HdrToU,
M=UUCP_MAILER_MAX, _OPTINS(`UUCP_MAILER_CHARSET', `C=', `, ')T=X-UUCP/X-UUCP/X-Unix,_UUCP_QGRP
A=UUCP_MAILER_ARGS
Muucp-old, P=UUCP_MAILER_PATH, F=_MODMF_(CONCAT(`DFMhuUd', UUCP_MAILER_FLAGS), `UUCP'), S=FromU, R=EnvToU/HdrToU,
M=UUCP_MAILER_MAX, _OPTINS(`UUCP_MAILER_CHARSET', `C=', `, ')T=X-UUCP/X-UUCP/X-Unix,_UUCP_QGRP
A=UUCP_MAILER_ARGS
# smart UUCP mailer (handles multiple addresses) (two names)
Msuucp, P=UUCP_MAILER_PATH, F=_MODMF_(CONCAT(`mDFMhuUd', UUCP_MAILER_FLAGS), `UUCP'), S=FromU, R=EnvToU/HdrToU,
M=UUCP_MAILER_MAX, _OPTINS(`UUCP_MAILER_CHARSET', `C=', `, ')T=X-UUCP/X-UUCP/X-Unix,_UUCP_QGRP
A=UUCP_MAILER_ARGS
Muucp-new, P=UUCP_MAILER_PATH, F=_MODMF_(CONCAT(`mDFMhuUd', UUCP_MAILER_FLAGS), `UUCP'), S=FromU, R=EnvToU/HdrToU,
M=UUCP_MAILER_MAX, _OPTINS(`UUCP_MAILER_CHARSET', `C=', `, ')T=X-UUCP/X-UUCP/X-Unix,_UUCP_QGRP
A=UUCP_MAILER_ARGS
ifdef(`_MAILER_smtp_',
`# domain-ized UUCP mailer
Muucp-dom, P=UUCP_MAILER_PATH, F=_MODMF_(CONCAT(`mDFMhud', UUCP_MAILER_FLAGS), `UUCP'), S=EnvFromUD/HdrFromSMTP, R=ifdef(`_ALL_MASQUERADE_', `EnvToSMTP/HdrFromSMTP', `EnvToSMTP'),
M=UUCP_MAILER_MAX, _OPTINS(`UUCP_MAILER_CHARSET', `C=', `, ')T=X-UUCP/X-UUCP/X-Unix,_UUCP_QGRP
A=UUCP_MAILER_ARGS
# domain-ized UUCP mailer with UUCP-style sender envelope
Muucp-uudom, P=UUCP_MAILER_PATH, F=_MODMF_(CONCAT(`mDFMhud', UUCP_MAILER_FLAGS), `UUCP'), S=EnvFromUUD/HdrFromSMTP, R=ifdef(`_ALL_MASQUERADE_', `EnvToSMTP/HdrFromSMTP', `EnvToSMTP'),
M=UUCP_MAILER_MAX, _OPTINS(`UUCP_MAILER_CHARSET', `C=', `, ')T=X-UUCP/X-UUCP/X-Unix,_UUCP_QGRP
A=UUCP_MAILER_ARGS')
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