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), and DNS-based distributed checksumming (DNS DCC) similar to Vipul's Razor. Features can be filtered on a per-address basis, and since MessageWall communicates via SMTP, it works with any MTA. It also offers message tagging as a per-address configurable alternative to message blocking.
京公网安备 11010502034610号