Try Freeware EMWAC Internet Mail Services for Windows NT: http://www1.sica.com/IMS/ LK >>> brstephe@xxxxxxxxx 10-4-03 2:28:01 >>> http://www.ISAserver.org Greetings - I need a solution to stop spam from clogging users inboxes. I have two thoughts on this related to ISA and the SMTP filter and wondered if anyone would be willing to provide some feedback/suggestions/comments/etc. 1. Is anyone running some mailserver on their ISA box to forward to internal domains other than MS's SMTP server from IIS? Since many mailservers support the use of external files for filtering keywords and addresses, I wondered if anyone had tried this solution. 2. Option would be to develop an import/export app for the SMTP filter that would allow users to import blacklist files into the filter config. I might be willing to take a crack at this, would anyone be willing to share the known registry keys related to the SMTP filter, where it holds its config, and the reg key size limits that you've encountered. Thanks - Brian