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SpamSieve is a robust spam filter for major email clients that uses powerful Bayesian spam filtering.

SpamSieve understands what your spam looks like in order to block it all, but also learns what your legitimate messages look like to avoid confusion. SpamSieve only marks spam in your email client so you never lose any mail.

What's New

Version 2.9.30:

Note: Now requires OS X 10.7 or later running on a 64-bit Intel processor

  • SpamSieve is now 64-bit only and requires OS X 10.7 or later.
  • Made various changes to improve SpamSieve’s filtering accuracy
  • You can now click the Outlook - Filter Mailboxes icon in the Dock to make it filter the new inbox messages immediately instead of waiting


  • OS X 10.7 or later
  • Works with:
    • Apple Mail
    • Airmail
    • Emailer
    • Entourage
    • Outlook 2011
    • Outlook Express
    • Eudora 5.2 or 6.x (Sponsored or Paid)
    • MailForge
    • MailMate
    • Mailsmith
    • GyazMail
    • Postbox
    • PowerMail
    • Thunderbird 2

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SpamSieve User Discussion

4.6 124


Current Version (2.x)


Downloads 165,682
Version Downloads 879
License Shareware
Date 30 Jan 2018
Platform Intel 64 / OS X
Price $30.00
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