MessageWall is a free software SMTP proxy. It sits between the outside world and your mail server and keeps out viruses, spam and mail relaying. Unlike many existing ISP-level filtering solutions, it offers customization of filtering features on a per-address basis. MessageWall employs a scoring system that allows message rejection based on multiple rules with different weights, and header tagging when the message doesn't reach the threshold.
MessageWall organizes filtering customizations into profiles. The configuration file defines a default profile, and a seperate file specifies addresses and domains with profiles other than the default. Each profile contains a set of rules for how to filter mail. The available rules are:
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