Hi all, I've already installed and played a bit with OTRS and my system is up and running, taking the customer from an external DB where our authorized customer date (i.e his email) is stored. Now I'm wondinrg how to do to make OTRS filter the incoming emails depending on the "from" of an email. In fact, what I exactly want to do is to accept emails only from my authorized customers. I believe is quite useful to avoid spam and also to limit the access to the service to authorized customers. I've been having a look to Postmaster filters but it seems that it will not be possible because I can set a filter to parse the "from" of an email searching for an regex that I've to prepare in advance. Then depending on the regex match the email will be direct to an specific queue. But I would like to parse the "from" and then look up in the DB for this email and if there is a match then forward to a queue. And the point is also, how this will work with follow-up tickets? As far as I've understood follow-up mails are "detected" before the PostMaster filters are applied, so in the case I set-up a filter like the one I need, if somebody send an email with a correct ticket number, the email will be processed directly to the existing ticket, or will it be first processed by PostMaster Filter? I'm a bit confused with that. It seems to me that it's a bit tricky to hardening OTRS in order to accept emails only from authorized customer emails. Anyone can share his experience and solutions? Thanks, Rafa.