Spamsieve 2.9.51 May 2026

Version 2.9.51 supports macOS from 10.13 High Sierra up to macOS 13 Ventura. It integrates with numerous clients including Apple Mail, Outlook, Airmail, and MailMate.

When used with Apple Mail, the background launch agent now correctly identifies itself as "SpamSieve" rather than "C-Command Software" in System Settings. SpamSieve 2.9.51

SpamSieve 2.9.51 is a maintenance update for the long-standing Bayesian spam filtering utility for Mac, released in January 2023. While it is now a legacy version—succeeded by major versions like —it remains a highly effective choice for users on older macOS versions. Key Features and Performance Version 2

Renamed "Preferences" to "Settings" to match system changes and improved diagnostic reporting. SpamSieve 2

Unlike server-side filters, all processing is done locally on your Mac; the app does not require access to your login credentials or transmit your mail data elsewhere.

By running SpamSieve on a Mac that stays on, it can filter spam for your iPhone and iPad by cleaning the server-side inbox before your mobile devices fetch the mail. What's New in 2.9.51