Hi all, Finally, I've managed to make a filter to do what I really wanted. I'm on a Linux platform using CPanel server, that uses Exim MTA. Procmail and all won't work, so my best bet was to make an Exim filter, but I was too lazy to learn that, and mess up the Exim config... So I decided to make a PHP filter script that receives the mailpipe from Exim and then decide what to do with it. For me, I wanted that only valid customer users that has been created to be able to send in requests via e-mail. I don't want other people mailing support helpdesk and especially not SPAM! :p So I made Exim pipe the mail data into my PHP script, and let me PHP script queries the OTRS mysql database for a valid user in the database for that mail sender. If found, the mail will then be piped to PostMaster.pl, if not, it is discarded. Well, at least it solved my spam issue :p I've attached the script with sufficient information inside on how to use... You can always e-mail me or reply to this topic on the mailing list (grr, I hate mailing lists! Prefer forums!) if you need help to use it or customise it.. I'll try my best... Since I'm on 2 months break :p Best regards, Au Yong