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?
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@example.com 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.