Just a thought, but are you hosting email on the OTRS box, or using some other email system? 

My thought is to do your filtering on your email system rather than your OTRS system.  Have an approved list of sender emails that you will actually accept emails from, and bounce or delete the rest.

Loren

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From: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] On Behalf Of José Mestre
Sent: Thursday, August 07, 2008 3:37 AM
To: otrs@otrs.org
Subject: [otrs] How to filter incoming emails

I'm using OTRS 2.2.6 and I would like to filter incoming emails.

Is it possible to create a filter that will create tickets only for known (in database) customers ?

If yes how can I do that ?

Thanks.