Hi all, What I was missing from ispconfig3 is the possibility to filter mails server side on the mailing list ID (called 'List-Id:' header). So I added it to the interface and create the attached patch (against stable-3.1). Would be great if this could become part of Ispconfig3. Apart from adding more standard fields to filter from, it would be great to be able to enter free-form text in the combo box. Unfortunately, I currently lack the knowledge how to do that. So this patch is a first step. I tested in on my live system and it is working fine. Thanks for this great peace of software! Cheers, Bas.