SpamSieve Background
SpamSieve Icon

Robust spam filter for major email clients.

0 Ratings
All Versions
Total Downloads
Downloads Last Week
Current Version
Total Downloads
Downloads Last Week
Downloads Last 10 Weeks
All Versions
0 Ratings
Current Version
0 Ratings


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.


  • Works with Apple Mail under Mac OS X 10.11 El Capitan. It’s easiest if you update to SpamSieve 2.9.21 before updating to El Capitan. In any case, if you don’t see the SpamSieve commands in Apple Mail’s Message menu, be sure to choose Install Apple Mail Plug-In from the SpamSieve menu. Otherwise, with the SpamSieve plug-in not installed, Mail will move good messages to the spam mailbox without consulting SpamSieve.
  • Made various changes to improve SpamSieve’s filtering accuracy.
  • Microsoft Outlook 2016 removes the Run AppleScript rule action feature. This makes it impossible to create a rule that automatically processes incoming messages with SpamSieve. We recommend using the "send-a-smile" button in Outlook’s main window (below the search field) to send Microsoft feedback, asking them to prioritize this feature. Please see this forum post for more information and workarounds for using SpamSieve with Outlook 2016.
  • Added the Outlook - Filter Mailboxes script as a workaround for automatically filtering messages with Outlook 2016.
  • Added support for App Transport Security on Mac OS X 10.11.
  • Modernized code for the Xcode 7 compiler and the Mac OS X 10.11 SDK.
  • The About, Software Update, and help windows now use the San Francisco font on Mac OS X 10.11.
  • Added the following sections to the manual:
    • Filtering Spam During Power Nap
    • Should I download SpamSieve from this free site?
  • Improved the following sections of the manual:
    • Automatically Deleting Old Spam Messages
    • Checking the Apple Mail Setup
    • Correct All Mistakes
    • Installing SpamSieve
    • iPhone Spam Filtering
    • Play sound
    • Save false negatives to disk
    • Sending in an Error Report
    • Sending in Apple Mail Rules
    • Setting Up Airmail
    • Setting Up an Apple Mail Drone
    • Setting Up Gmail, iCloud, Yahoo, AOL, or Other Web Mail
    • Setting Up Outlook 2016
    • Spam Message Colors in Apple Mail
    • SpamSieve and Multiple Macs
    • Turning Off the Gmail Spam Filter
    • What can I do if Apple Mail is crashing?
    • Why does a message disappear or go back to the spam mailbox after I train it as good?
  • When SpamSieve encounters a permissions error, it now reports on any applicable ACLs (Access Control Lists).
  • Improved the error message when your version of SpamSieve is too old for the current version of Mac OS X.
  • Added "(?)" to error text to help people know what "Help button" refers to.
  • If a PDF file attached to an e-mail triggers an OS bug that leads to an infinite loop, SpamSieve now aborts the spamsieve-reader process after 30 seconds. Previously, the process (and your fan) would keep running forever and possibly freeze the mail client.
  • Worked around a bug in Mac OS X 10.11 that could cause a crash during Software Update….
  • Worked around a bug in Mac OS X 10.6 and 10.7 that could cause a crash.
  • Added defensive coding to try to prevent a crash when saving the corpus to disk.
  • Fixed a regression that could cause an error when switching applications.
  • Fixed a regression where SpamSieve wasn’t able to reset the corpus.
  • Fixed a regression where the Entourage scripts could not be installed.
  • Fixed a bug where Software Update… would continue offering updates in the same session in which you had held down the Option key.
  • Fixed a bug where SpamSieve could crash when sending data to a helper tool that exited unexpectedly.
  • Fixed a bug where a text field in the crash reporter was truncated.
  • Fixed a few small memory leaks.
  • Updated the German localization.

SpamSieveTech Specs

Free to try
File Size
15 MB
Operating Systems
Mac OS X
System Requirements
  • OS X 10.6.8 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

AppsSelected For You

Spamfire X Icon
Michael Herrick
Fight spam with this email filter app.
Postbox Icon
Postbox, Inc.
Powerful and flexible email client.
Direct Mail Icon
e3 Software
Create and send great looking email campaigns.
A to G Icon
Ben Borofka
The easy way to get your Mac OS X address book into Gmail.
Herald Icon
Erik Hinterbichler
Notification plugin for
TextSoap Icon
Unmarked Software
Flexible text editing utility.
Google Hosted Mail Notifier Icon
Troels Bay
Gmail notifier for your hosted domain.
Sparrow Icon
Dinh Viêt Ho
Minimalist e-mail for IMAP accounts.