MessageWall is an SMTP proxy. It sits between the outside world and your mail server and keeps out viruses, spam, and mail relaying. It offers filtering via header and body checks, DNS-based blacklists for IP addresses (DNSBL) and domains (RHSBL), DNS-based distributed checksumming (DNS DCC) similar to Vipul's Razor, and Open AntiVirus pattern scanning. ke many existing ISP-level filtering solutions, it offers customization of filtering features on a per-address basis. Unlike SpamAssassin, it communicates via SMTP, so it works with any MTA. It also supports scoring based on rules with a rejection threshold; this allows hybrid warning/rejection configurations based on how many and which rules a message matches. WWW: http://www.messagewall.org - Pieter opr@bsdaemon.be