Date: Wed, 28 Jan 1998 08:23:23 -0500 (EST) From: Cliff Addy <fbsdlist@federation.addy.com> To: questions@FreeBSD.ORG Subject: Stopping mail relaying (again) Message-ID: <Pine.BSF.3.95q.980128081607.19174A-100000@federation.addy.com>
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According to the anti-relaying stuff on sendmail.org, this will stop
relaying if placed in sendmail.cf:
#LOCAL_CONFIG
FR-o /etc/sendmail.cf.relays
#LOCAL_RULESETS
Scheck_rcpt
# anything terminating locally is ok
R< $+ @ $=w > $@ OK
R< $+ @ $=R > $@ OK
# anything originating locally is ok
R$* $: $(dequote "" $&{client_name} $)
R$=w $@ OK
R$=R $@ OK
R$@ $@ OK
# anything else is bogus
R$* $#error $: "550 Relaying Denied"
My question is: is it checking the machine name that's making the smtp
connection to you or just the To: and From: headers? In other words, if I
place "abc.com" into the sendmail.cf.relays file, will a user dialed into
the ISP "def.com" be able to relay as long as his copy of Netscape has
"joe_user@abc.com" as the return address? Or will it get rejected because
sendmail sees the connection is coming from "dialup247.def.net"?
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