Spamassassin, RBLs, and Dialup

Christoph Berg

February 17, 2006

I’m using SMTP over dialup to my smarthost. Unfortunately that doesn’t stop spamassassin to think I am a spammer:


 0.1 FORGED_RCVD_HELO       Received: contains a forged HELO
 0.1 RCVD_IN_SORBS_DUL      RBL: SORBS: sent directly from dynamic IP address
                            [84.58.218.241 listed in dnsbl.sorbs.net]
 1.8 RCVD_IN_BL_SPAMCOP_NET RBL: Received via a relay in bl.spamcop.net
               [Blocked - see <http://www.spamcop.net/bl.shtml?70.103.162.29>]
 2.5 RCVD_IN_XBL            RBL: Received via a relay in Spamhaus XBL
                            [84.58.218.241 listed in sbl-xbl.spamhaus.org]
 1.7 RCVD_IN_NJABL_DUL      RBL: NJABL: dialup sender did non-local SMTP
                            [84.58.218.241 listed in combined.njabl.org]

My previous solution was to use an openvpn tunnel to the smarthost, but my current one (provided by codebreaker) is a vserver, so that doesn’t work. Ganneff provided the workaround: make postfix drop the Received: header.

[0] cb@tesla:~ $grep header /etc/postfix/main.cf
header_checks = pcre:/etc/postfix/header_checks

[0] cb@tesla:~ $cat /etc/postfix/header_checks
/^Received: from [a-z]*\.df7cb\.de \(dslb-[0-9.-]*\.pools\.arcor-ip\.net/ IGNORE

Received: from tesla.df7cb.de ([88.198.227.218] ident=postfix)
        by merkel.debian.org with esmtp (Exim 4.50) id 1GmX3t-0000Pw-4I
        for ???@qa.debian.org; Tue, 21 Nov 2006 07:57:27 -0700
Received: by volta.df7cb.de (Postfix, from userid 1000)
        id 69AB218EAC; Tue, 21 Nov 2006 15:58:57 +0100 (CET)

Of course this is a gross hack, but I’m happy with it :)

Debian