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 : Defeat Non-SMTP Protocols
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Don't let spammers use non-standard protocols! JSpamFilter can defeat non-SMTP protocols. In particular, JSpamFilter can keep your Microsoft Exchange server from being targetted by spammers who exploit the proprietary Microsoft XEXCH50 Inter-Exchange communication protocol.
Non SMTP protocols give spammers a back door to inboxes!

Full details can be found in the JSpamFilter Manual Section:
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