ient rewriting
#
SEnvToL
R$+ < @ $* >		$: $1			strip host part
R$+ + $*		$: < $&{addr_type} > $1 + $2	mark with addr type
R<e s> $+ + $*		$: $1			remove +detail for sender
R< $* > $+		$: $2			else remove mark

#
#  Header sender rewriting
#
SHdrFromL
R<@>			$n			errors to mailer-daemon
R@ <@ $*>		$n			temporarily bypass Sun bogosity
R$+			$: $>AddDomain $1	add local domain if needed
R$*			$: $>MasqHdr $1		do masquerading

#
#  Header recipient rewriting
#
SHdrToL
R$+			$: $>AddDomain $1	add local domain if needed
R$* < @ *LOCAL* > $*	$: $1 < @ $j . > $2

#
#  Common code to add local domain name (only if always-add-domain)
#
SAddDomain

Mlocal,		P=/usr/sbin/sensible-mda, F=lsDFMAw5:/|@qPn9S, S=EnvFromL/HdrFromL, R=EnvToL/HdrToL,
		T=DNS/RFC822/X-Unix,
		A=sensible-mda $g $u $h ${client_addr}
Mprog,		P=/bin/sh, F=lsDFMoqeu9, S=EnvFromL/HdrFromL, R=EnvToL/HdrToL, D=$z:/,
		T=X-Unix/X-Unix/X-Unix,
		A=sh -c $u

#####################################
###   SMTP Mailer specification   ###
#####################################

#####  $Id: smtp.m4,v 8.66 2013-11-22 20:51:14 ca Exp $  #####

#
#  common sender and masquerading recipient rewriting
#
SMasqSMTP
R$* < @ $* > $*		$@ $1 < @ $2 > $3		already fully qualified
R$+			$@ $1 < @ *LOCAL* >		add local qualification

#
#  convert pseudo-domain addresses to real domain addresses
#
SPseudoToReal

# pass <route-addr>s through
R< @ $+ > $*		$@ < @ $1 > $2			resolve <route-addr>

# output fake domains as user%fake@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 < @ $4 >			strip mailer: part
R$+ < @ >		$: $1 < @ *LOCAL* >		if no UUCP_RELAY


#
#  envelope sender rewriting
#
SEnvFromSMTP
R$+			$: $>PseudoToReal $1		sender/recipient common
R$* :; <@>		$@				list:; special case
R$*			$: $>MasqSMTP $1		qualify unqual'ed names
R$+			$: $>MasqEnv $1			do masquerading


#
#  envelope recipient rewriting --
#  also header recipient if not masquerading recipients
#
SEnvToSMTP
R$+			$: $>PseudoToReal $1		sender/recipient common
R$+			$: $>MasqSMTP $1		qualify unqual'ed names
R$* < @ *LOCAL* > $*	$: $1 < @ $j . > $2

#
#  header sender and masquerading header recipient rewriting
#
SHdrFromSMTP
R$+			$: $>PseudoToReal $1		sender/recipient common
R:; <@>			$@				list:; special case

# do special header rewriting
R$* <@> $*		$@ $1 <@> $2			pass null host through
R< @ $* > $*		$@ < @ $1 > $2			pass route-addr through
R$*			$: $>MasqSMTP $1		qualify unqual'ed names
R$+			$: $>MasqHdr $1			do masquerading


#
#  relay mailer header masquerading recipient rewriting
#
SMasqRelay
R$+			$: $>MasqSMTP $1
R$+			$: $>MasqHdr $1

Msmtp,		P=[IPC], F=mDFMuX, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,
		T=DNS/RFC822/SMTP,
		A=TCP $h
Mesmtp,		P=[IPC], F=mDFMuXa, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,
		T=DNS/RFC822/SMTP,
		A=TCP $h
Msmtp8,		P=[IPC], F=mDFMuX8, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,
		T=DNS/RFC822/SMTP,
		A=TCP $h
Mdsmtp,		P=[IPC], F=mDFMuXa%, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,
		T=DNS/RFC822/SMTP,
		A=TCP $h
Mrelay,		P=[IPC], F=mDFMuXa8, S=EnvFromSMTP/HdrFromSMTP, R=MasqSMTP, E=\r\n, L=2040,
		T=DNS/RFC822/SMTP,
		A=TCP $h


### /etc/mail/sendmail.mc ###
# divert(-1)dnl
# #-----------------------------------------------------------------------------
# # $Sendmail: debproto.mc,v 8.15.2 2020-03-08 00:39:49 cowboy Exp $
# #
# # Copyright (c) 1998-2010 Richard Nelson.  All Rights Reserved.
# #
# # cf/debian/sendmail.mc.  Generated from sendmail.mc.in by configure.
# #
# # sendmail.mc prototype config file for building Sendmail 8.15.2
# #
# # Note: the .in file supports 8.7.6 - 9.0.0, but the generated
# #	file is customized to the version noted above.
# #
# # This file is used to configure Sendmail for use with Debian systems.
# #
# # If you modify this file, you will have to regenerate /etc/mail/sendmail.cf
# # by running this file through the m4 preprocessor via one of the following:
# #	* make   (or make -C /etc/mail)
# #	* sendmailconfig
# #	* m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# # The first two options are preferred as they will also update other files
# # that depend upon the contents of this file.
# #
# # The best documentation for this .mc file is:
# # /usr/share/doc/sendmail-doc/cf.README.gz
# #
# #-----------------------------------------------------------------------------
# divert(0)dnl
# #
# #   Copyright (c) 1998-2005 Richard Nelson.  All Rights Reserved.
# #
# #  This file is used to configure Sendmail for use with Debian systems.
# #
# define(`_USE_ETC_MAIL_')dnl
# include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
# VERSIONID(`$Id: sendmail.mc, v 8.15.2-18 2020-03-08 00:39:49 cowboy Exp $')
# OSTYPE(`debian')dnl
# DOMAIN(`debian-mta')dnl
# dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
# undefine(`confHOST_STATUS_DIRECTORY')dnl        #DAEMON_HOSTSTATS=
# dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
# dnl #
# dnl # General defines
# dnl #
# dnl # SAFE_FILE_ENV: [undefined] If set, sendmail will do a chroot()
# dnl #	into this directory before writing files.
# dnl #	If *all* your user accounts are under /home then use that
# dnl #	instead - it will prevent any writes outside of /home !
# dnl #   define(`confSAFE_FILE_ENV',             `')dnl
# dnl #
# dnl # Daemon options - restrict to servicing LOCALHOST ONLY !!!
# dnl # Remove `, Addr=' clauses to receive from any interface
# dnl # If you want to support IPv6, switch the commented/uncommentd lines
# dnl #
# FEATURE(`no_default_msa')dnl
# dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA-v6, Port=smtp, Addr=::1')dnl
# DAEMON_OPTIONS(`Family=inet,  Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl
# dnl DAEMON_OPTIONS(`Family=inet6, Name=MSP-v6, Port=submission, M=Ea, Addr=::1')dnl
# DAEMON_OPTIONS(`Family=inet,  Name=MSP-v4, Port=submission, M=Ea, Addr=127.0.0.1')dnl
# dnl #
# dnl # Be somewhat anal in what we allow
# define(`confPRIVACY_FLAGS',dnl
# `needmailhelo,needexpnhelo,needvrfyhelo,restrictqrun,restrictexpand,nobodyreturn,authwarnings')dnl
# dnl #
# dnl # Define connection throttling and window length
# define(`confCONNECTION_RATE_THROTTLE', `15')dnl
# define(`confCONNECTION_RATE_WINDOW_SIZE',`10m')dnl
# dnl #
# dnl # Features
# dnl #
# dnl # use /etc/mail/local-host-names
# FEATURE(`use_cw_file')dnl
# dnl #
# dnl # The access db is the basis for most of sendmail's checking
# FEATURE(`access_db', , `skip')dnl
# dnl #
# dnl # The greet_pause feature stops some automail bots - but check the
# dnl # provided access db for details on excluding localhosts...
# FEATURE(`greet_pause', `1000')dnl 1 seconds
# dnl #
# dnl # Delay_checks allows sender<->recipient checking
# FEATURE(`delay_checks', `friend', `n')dnl
# dnl #
# dnl # If we get too many bad recipients, slow things down...
# define(`confBAD_RCPT_THROTTLE',`3')dnl
# dnl #
# dnl # Stop connections that overflow our concurrent and time connection rates
# FEATURE(`conncontrol', `nodelay', `terminate')dnl
# FEATURE(`ratecontrol', `nodelay', `terminate')dnl
# dnl #
# dnl # If you're on a dialup link, you should enable this - so sendmail
# dnl # will not bring up the link (it will queue mail for later)
# dnl define(`confCON_EXPENSIVE',`True')dnl
# dnl #
# dnl # Dialup/LAN connection overrides
# dnl #
# include(`/etc/mail/m4/dialup.m4')dnl
# include(`/etc/mail/m4/provider.m4')dnl
# dnl #
# dnl # Default Mailer setup
# MAILER_DEFINITIONS
# MAILER(`local')dnl
# MAILER(`smtp')dnl
#