El vie, 14-10-2011 a las 17:13 -0400, Néstor Rodríguez-Triana Domínguez escribió: > Hi everybody: > > I need to know how to avoid Mail Spoofing in my Exim server. > > Thanks.
From http://wiki.exim.org/AclHeloTricks Some spammers put the server's interface address they connect to in their HELO, maybe asuming it is whitelisted or something. drop condition = ${if eq{[$interface_address]}{$sender_helo_name}} message = $interface_address is _my_ address Note: If you are running your mail server behind NAT, you should replace $interface_address with your external IP address. Note: If you have more than one ip-addresses on your's interface use @[] instead of $interface_address, full acl will be: drop message = Bad helo name condition = ${if \ and{ \ {isip {$sender_helo_name}} \ {match_ip{$sender_helo_name}{@[]}} \ }{yes}{no} \ } JulHer
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