Date: Sat, 10 May 1997 16:06:07 -0600 (MDT) From: John-David Childs <jdc@denver.net> To: Shawn Ramsey <shawn@luke.cpl.net> Cc: questions@FreeBSD.ORG Subject: Re: smtp server? Message-ID: <Pine.BSD/.3.91.970510155748.17429A-100000@milehigh.denver.net> In-Reply-To: <Pine.BSF.3.95.970510131044.264A-100000@luke.cpl.net>
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On Sat, 10 May 1997, Shawn Ramsey wrote: > > http://spam.abuse.net/spam > > http://www.informatik.uni-kiel.de/%7Eca/email/check.html#check_rcpt > > > > > > Be prepared to deal with a lot of users who have multiple dialup accounts > > and/or access the net from work via a different provider ;( > > It seems the solution at www.informatik.... will let you set it so you can > relay only for who you want. Does anyone already have a sendmail.cf with > this ruleset already set? I don't use/have a .mc file, and tried putting > it directly into sendmail.cf, but get lots of errors. :( > Here's a diff of my sendmail.cf with and without the HACKS from www.informatik (note that I didn't put the {LocalIP, RelayTO, LocalNames, JUNK} files in the "standard" places): 78a80,103 > ##### @(#)use_ip.m4 1.0 (Claus Assmann) 1996-11-23 ##### > > > > > ##### @(#)use_relayto.m4 1.0 (Claus Assmann) 1996-11-23 ##### > > > > ##### @(#)use_names.m4 1.0 (Claus Assmann) 1996-11-23 ##### > > > > > ##### @(#)check_mail.m4 2.0 (Claus Assmann) 1997-03-23 ##### > > > > > > ##### @(#)check_rcpt4.m4 2.3 (Claus Assmann) 1997-03-16 ##### > > > 158a184,198 > # file containing IP numbers of machines which can use our relay > F{LocalIP} /etc/adm/mail/mailip > > # file containing names we relay to > F{RelayTo} /etc/adm/mail/mailrelayto > > # file containing names of machines which can use our relay > F{LocalNames} /etc/adm/mail/mailnames > > # file containing full e-mail addresses of well-known spammers: > # spammer@address.domain SPAMMER > # or junk domain: > # junk.domain JUNK > Kjunk btree /etc/adm/mail/junk > 533a574,576 > > > 785a829,883 > > > > # check for junk domain/spammers > Sjunk > # lookup domain in database > R$*<@$+>$* $:$1<@$(junk $2$)>$3 > # exists? return > R$*<@JUNK>$* $@$1<@JUNK>$2 > # lookup address in database > R$*<@$+>$* $:$1<@$(junk $1@$2 $:$2$)>$3 > # exists? return > R$*<@SPAMMER>$* $@$1<@SPAMMER>$2 > # mv one subdomain in front, try again > R$*<@$-.$-.$+>$* $: $2<@> $>junk $1<@$3.$4>$5 > # undo damage > R$*<@>$*<@$+>$* $2<@$1.$3>$4 > > Scheck_mail > # don't check these > R<$*@$=w> $@ ok shortcut > R$* $: $>3 $1 canonify > R$- $@ ok local host > # no host without a . in the FQHN ? > R$*<@$->$* $#error $@ 5.1.8 $: 518 invalid host name $2, check your configuration. > # this is dangerous! no real name > # R$*<@$*$~P>$* $#error $@ 4.1.8 $: 418 unresolvable host name $2$3, check your setup. > # now remove the dot > R$*<@$*.>$* $: $1<@$2>$3 > # and check the database > R$*<@$*>$* $: $>junk $1<@$2>$3 > R$*<@$*JUNK>$* $#error $@ 5.7.1 $: "571 This domain is banned, contact your local admin." go away > R$*<@$*SPAMMER>$* $#error $@ 5.7.1 $: "571 You are banned, contact your local admin." go away > > > > Scheck_rcpt > # first: get client address > R$+ $: $(dequote "" $&{client_addr} $) $| $1 > R0 $| $* $@ ok client_addr is 0 for sendmail -bs > R$={LocalIP}$* $| $* $@ ok from here > # next: get client name > R$* $| $+ $: $(dequote "" $&{client_name} $) $| $2 > R $| $* $@ ok no client name: directly invoked > #R$- $| $* $@ ok for those without full DNS... > R$*$=w $| $* $@ ok from here > R$*$={LocalNames} $| $* $@ ok from allowed system > # now check other side > R$* $| $* $: $>3 $2 > # remove RelayTo part (maybe repeatedly) > R$*<@$*$={RelayTo}.>$* $>3 $1 $4 > # remove local part (maybe repeatedly) > R$*<@$=w.>$* $>3 $1 $3 > # still something left? > R$*<@$+>$* $#error $@ 5.7.1 $: 571 we do not relay
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