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"Milter" == "Mail Filter"
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Multi-threaded interface/API/library
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Filter is in a separate process from Sendmail for security
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Communication via sockets
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Better approach to filtering based on content or RFC 822
headers than adding rules to sendmail.cf
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Licensing still uncertain; may not be usable in commercial
products
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Sendmail::Milter
module available from CPAN/SourceForge
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