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Sendmail "Milter" API

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