El vie, 14-10-2011 a las 17:13 -0400, Néstor Rodríguez-Triana Domínguez
escribió:
> I need to know how to avoid Mail Spoofing in my Exim server.
>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} \
}
Julio
