Re: [Exim] Feature request regarding invalid EHLO/HELO

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Autor: Philip Hazel
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A: Stian Grytoyr
CC: exim-users
Assumpte: Re: [Exim] Feature request regarding invalid EHLO/HELO
On 17 Apr 2002, Stian Grytoyr wrote:

> My suggestion is to have some option that can be enabled,
> which makes Exim log invalid HELO/EHLOs with a warning to
> mainlog (or perhaps some other log file), but without an
> error being sent to the "offending" server. I don't know if
> anyone else sees the need for this, but I think it would be
> neat :)


I can think of several ways of doing this, all of which make use of the
$sender_helo_name variable.

(1) Put something in a system filter:

      if $sender_helo_name matches ...  then logwrite ....


(2) Put something in an ACL

      warn   logmessage = bad helo $sender_helo_name from $sender_host_address
             condition = ${if match{$sender_helo_name}{...}{yes}{no}}


where in each case you need a regular expression that matches bad names.
Actually, it might be easier to write a regex that matches good names,
and turn the tests the other way round.

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.