Does anyone know how Mail decide junk message, in addition to trusting spamassassin header? For example, if I mark a message as junk, what criteria does Mail create?

2 Answers 2


Mail.app uses more than one approach to junk mail.

  • Some spam gets reported by other users.

    • You can forward your junk mail to [email protected] and it gets added to Apple's filtering system.
  • Mail servers sometimes mark messages as spam.

    • When a tool like spam assassin has marked an incoming message as junk, Mail.app respects that and passes it to the junk folder automatically.
  • Mail.app also supports custom filters.

    • You can make your own filters that will direct junk mail into the junk folder.

You can add the mail address that it is coming from to your contacts and the mail will no longer mark incoming mail from that address as Junk

  • This makes no attempt to answer the question being asked.
    – grg
    Commented Aug 7, 2015 at 15:59

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