Spamsieve 2.9.51 Apr 2026

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.

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

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 SpamSieve 2.9.51

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

Renamed "Preferences" to "Settings" to match system changes and improved diagnostic reporting. Unlike server-side filters, all processing is done locally

Improved error messaging for AppleScript failures during training. User Sentiment C-Command Software Blog - SpamSieve 2.9.51

The core "trick" of SpamSieve is its ability to learn from your specific email habits. Reviewers consistently report accuracy rates of 99% or higher after a brief training period. Key Features and Performance By running SpamSieve on

This specific update introduced minor but useful refinements for users on newer systems at the time: