Mozilla Thunderbird Icon

Mozilla Thunderbird

Email client from Mozilla.

Mozilla ThunderbirdOverview

As of July 2012, Thunderbird has transitioned to a new governance model, with new features being developed by the broader free software and open source community, and security fixes and improvements handled by Mozilla.

Thunderbird is a free, open-source, cross-platform e-mail and news (NNTP) client developed by the Mozilla Foundation. The project strategy is modeled after Mozilla Firefox, a project aimed at creating a Web browser.



  • Embedded images not shown in email received from Hotmail/Outlook webmailer
  • Detection of non-ASCII font names in font selector
  • Attachment not forwarded correctly under certain circumstances
  • Multiple requests for master password when GMail OAuth2 is enabled
  • Large number of blank pages being printed under certain circumstances when invalid preferences were present
  • Messages sent via the Simple MAPI interface are forced to HTML
  • Calendar: Invitations can't be printed
  • Mailing list (group) not accessible from macOS or Outlook address book
  • Clicking on links with references/anchors where target doesn't exist in the message not opening in external browser
  • Various security fixes

Known Issues

  • Links in news messages including "remove all expired articles" not working

Mozilla ThunderbirdMore Information

File Size
79.1 MB
Operating Systems
Mac OS X
System Requirements
  • OS X 10.9 or later

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