# list of hosts and domains for whom we relay mail.
# all .forward hosts, domains must be listed in this file.
# same for hosts and domains in /etc/aliases
FR-o /etc/sendmail.cR

# database declarations
Kdenyip hash -o -a.REJECT /etc/mail/denyip.db
Kfakenames hash -o -a.REJECT /etc/mail/fakenames.db
Kspamsites hash -o -a.REJECT /etc/mail/spamsites.db

# helper rulsesets; useful for debugging sendmail configurations
#
#
Scheck_rbl
# lookup up an ip address in the Realtime Blackhole List.
R$-.$-.$-.$-	$: $(host $4.$3.$2.$1.rbl.maps.vix.com $:OK $)

Sxlat						# for sendmail -bt
# sendmail treats "$" and "|" as two distinct tokens
# this rule "pastes" them together into one token
# and then calls check_relay.
R$* $$| $*		$: $1 $| $2
R$* $| $*		$@ $>check_relay $1 $| $2

Scheck_relay
# called with "hostname.tld $| IP address" of connecting host.
# hostname.tld is the fully-qualified domain name
# IP address is dotted-quad with surrounding "[]" brackets.
#
# each group of rules in this ruleset is independent.
# each accepts and return "hostname.tld $| IP address"
# use the ones that you want comment out the rest
# you may rearrange the groups but not the rules in each group.
# each group is preceded and followed by a comment
#
# host must NOT be in the "spamsites" database--BEGIN
R$* $| $*		$: <$1 $| $2> $1
R<$*> $+.$+.$+		<$1> $3.$4
R<$*> $+.$+		$: <$1> $(spamsites $2.$3 $)
R<$*> $*.REJECT		$#error $: 521 blocked. contact postmaster@$m
R<$*> $*		$: $1
# host must NOT be in the "spamsites" database--END
# ip address must NOT be in the "denyip" database--BEGIN
R$* $| $*		$: $1 $| $(denyip $2 $)
R$* $| $*.REJECT	$#error $: 521 blocked. contact postmaster@$m
# ip address must NOT be in the "denyip" database--END
R$*			$@ OK

Scheck_mail
# called with envelope sender (everything after ":") in
# "Mail From: xxx", of SMTP conversation
#	may or may not have "<" ">"
# the groups of rules in this ruleset ARE NOT independent.
# "remove all RFC-822 comments" must come first
# "Connecting Host" and "Paul Vixie's RBL" must be last
#
# use the ones that you want comment out the rest
# each group is preceded and followed by a comment
#
# remove all RFC-822 comments--BEGIN
# MUST be first rule in check_mail rulseset.
R$*			$: $>3 $1
# remove all RFC-822 comments--END
# mail must come from a DNS resolvable host--BEGIN
R$* < @ $+ . >		$: $1 @ $2
R$* < @ $+ >		$#error $: "451 Domain does not resolve"
# mail must come from a DNS resolvable host--END
# mail must NOT come from a known source of spam--BEGIN
R$+ @$+			$: <$1@$2> $2
R<$*> $+.$+.$+		<$1> $3.$4
R<$*> $*		$: $(spamsites $2 $: OK $)
R$+.REJECT		$#error $: 521 $1 
R<$*> $*		$: $1
# mail must NOT come from a known source of spam--END
# Connecting Host must resolve--BEGIN
R$*			$: $1 $: $(dequote "" $&{client_name} $)
R$*			$: $>3 foo@$1
R<$*> $*<@$*>		$#error $: "451 Domain does not resolve"
# Connecting Host must resolve--END
# ip address must NOT be in Paul Vixie's RBL--BEGIN
R$*			$: $1 $: $(dequote "" $&{client_addr} $)
R$*			$: $>check_rbl $1
R$*.com.		$#error $: "550 Mail refused, see http://maps.vix.com/rbl"
# ip address must NOT be in Paul Vixie's RBL--END
R$*			$@ OK

Scheck_rcpt
# called with envelope recipient (everything after ":") in
# "Rcpt To: xxx", of SMTP conversation
#       may or may not have "<" ">" and or RFC-822 comments.
#	let ruleset 3 clean this up for us.
#
# do NOT reorder these two groups of rules.
# restrict mail relaying to host and domains listed in /etc/sendmail.cR
# 
# mail must NOT be addressed "fakenames"--BEGIN
R$*			$: <$1> $>3 $1
R<$*> $+ < @ $+ >	$: <$1> $(fakenames $2 $: OK $)
R$+.REJECT		$#error $: 521 $1
R<$*> $*		$: $1
# mail must NOT be addressed "fakenames"--END
# mail must come from or go to this machine or machines we allow to relay--BEGIN
# R$*			$: $>Parse0 $>3 $1
# R$+ < @ $* . > $*	$: $1 < @ $2 >
# R$+ < @ $=w>		$@ OK
# R$+ < @ $* $=R>	$@ OK
# R$*			$: $(dequote "" $&{client_name} $)
# R$=w			$@ OK
# R$* $=R			$@ OK
# R$@			$@ OK
# R$*			$#error $: "550 Relaying Denied"
# mail must come from or go to this machine or machines we allow to relay--END
R$*			$@ OK