SpamSieve 3.3
April 13th, 2026 (SpamSieve)Version 3.3 of SpamSieve is now available.
Save time by adding powerful spam filtering to the e-mail client on your Mac. SpamSieve gives you back your inbox, using Bayesian spam filtering to provide amazing accuracy that’s constantly improving. SpamSieve learns and adapts to your mail, so it’s able to block nearly all the junk—without putting good messages in the Junk mailbox. It’s quick and easy to control SpamSieve from within Apple Mail, Outlook, Airmail, MailMate, MailMaven, GyazMail, and more.
SpamSieve running on your Mac can keep the spam off your iPhone/iPad, and you can even train SpamSieve from your iOS device. SpamSieve protects your privacy. It does not need access to your mail account login and does not transmit your mail data anywhere. All the processing is done on your Mac.
SpamSieve 3.3 is a free update for those who have already purchased the SpamSieve 3.0 upgrade. If you’re using SpamSieve 2 and haven’t upgraded yet, the easiest way is to first let SpamSieve install the new version. At launch, it will show the Purchase window, and you can click the Check Upgrade Options button to get the upgrade discount without having to enter your old serial number.
The changes in this version are:
Made various changes to improve SpamSieve’s filtering accuracy.- When searching in the Corpus or Log window, you can now choose the search scope. This enables faster and more targeted searching. Additionally, you can now search by Raw Message Source and by Words, which were not possible before. These can be especially useful in finding messages that were not correctly trained—you can then fix them to improve SpamSieve’s filtering accuracy. The new Searching section of the manual explains the different ways of searching and when they might be useful. Each search field now has a Search Syntax Reference menu item to quickly open this section of the help.
Optimized’s SpamSieve’s message processing speed.- Improved SpamSieve’s recognition of headers from server spam filters.
- Added the Fixing Uncorrected Mistakes section of the manual.
Improved the following sections of the manual:
- Searching by message identifier now works when there’s extraneous whitespace.
- Improved the error reporting for Apple Mail remote training.
- Added a workaround for App Nap pausing filtering.
- Fixed a crash that could occur during a software update.
Fixed a bug that could cause SpamSieve to show its Settings window when it was being launched by Apple Mail or Outlook.- Fixed some crashes that could be caused by regex processing with invalid UTF-8.
Fixed a bug where recent searches were not shown in the menu until after the first search.- We need help updating SpamSieve’s Japanese localization. If you’re interested, please contact spamsieve@c-command.com.
SpamSieve 3.3 works with macOS 10.13 through macOS Tahoe 26 and requires an e-mail client. Older SpamSieve versions are available for older versions of macOS. In-depth information about SpamSieve is available in the manual.
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