From: Magnus Bäck (magnusdsek.lth.se)
Date: Sun Nov 04 2007 - 08:45:03 CST

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On Sunday, November 04, 2007 at 15:24 CET,
     Frank Agricola <fagricolasolcon.nl> wrote:

> I am trying to set up some very strict checks for incoming mail, the
> check that i would like to activate is reject_unknown_helo_hostname
> But if i do so, e-mail from customers with in incorrect configured
> dns/mailserver is beeing rejected as well.

If you want to stop spam I don't think reject_unknown_helo_hostname is
very effective compared to the false positives you are going to get.

> I would like to override this by doing an first check in some kind of
> whitelist file, if found in here - the remaing check should not be
> done and e-mail accepted.
> However this does not seem to work.
>
> I added an customer IP (61.177.163.164) in the mynetworks section en
> still the reject_unknown_helo_hostname rule is making the e-mail.not
> accepted (because correct A or MX dns info is missing for this ip)
> Of course when i works i will set up an better rule with and hash
> database file instead...

Indeed, you probably don't want to grant the client relay access, just
exempt them from rejection because of their HELO name.

Show "postconf -n" output and logs from a rejection that accoring to you
shouldn't take place.

[...]

--
Magnus Bäck
magnusdsek.lth.se

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