Re: best practices for fighting spam with Debian?

[Sven Hartge <sven@svenhartge.de>]

Vincent Lefevre <vincent@vinc17.net> wrote:
> On 2016-12-15 10:41:58 +0100, Sven Hartge wrote:

>> Next is a check if the sending IP resolves correctly and the hostname
>> resolves back to this IP.
>   ^^^^^^^^^^^^^^^^^^^^^^^^

> I wonder whether this rule should really be used. A hostname may
> resolve to multiple IP's, and for some reasons, the original IP may
> not be in the list (e.g. if truncated).

This is why this should not be a hard and final filter criterion but
just a hint you might want to look at this email a bit more in-depth.

S°

-- 
Sigmentation fault. Core dumped.