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Remove Duplicate Messages removes duplicate messages from the current selection in Apple Mail. The script determines whether a message is a duplicate of another message by examining these message headers:

  • MessageID
  • Subject
  • From
  • Date

If these message headers match another message in the view, the script flags the message as a duplicate and removes it from Mail.

The script displays interactive dialog boxes that allow you to specify whether you want duplicate messages to be removed or retained, optionally prompting you for each duplicate message it encounters

What's New

Version 1.3.5:
  • Fixed a bug introduced in version 1.3.4 where the script would generate an error and abort processing when encountering messages that were "On My Mac" and therefore had no associated Mail account. Thanks to David Jacobson and Michelle Wilson for reporting this issue.
  • Added a "Quit" button to the interactive dialog box that asks if you would like to remove a duplicate


  • OS X 10.6.8 or later

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Current Version (1.x)


Downloads 3,950
Version Downloads 1,542
License Free
Date 14 Feb 2016
Platform Intel 64 / OS X / Intel 32
Price Free
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