Post.Office provides powerful SMTP connection, header, and body filters which allow filtering not only for keywords, but for patterns and formatting as well. We have found this very effective at weeding out spam from mass-mailing user-agents without interfering with standard Emails. Administrators may also filter email using RBL type blacklist servers to prevent open-relay servers from sending mail to their users.
No other commercial email server on Mac OS X has these extensive capabilities.
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