
Apache SpamAssassin
7.4#4 in email anti-spam softwareFree planFree planAPILinuxmacOSSelf-hosted
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SpamAssassin suits system administrators who want to filter unsolicited email on a server and configure tests or rules. Its API and Perl modules also suit teams integrating filtering into supported mail systems.
It suits organizations, schools, churches, public offices and personal domain owners who use standard SMTP servers for domains they own. It is not intended for consumer Gmail or Hotmail accounts.