Thunderbird

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.

Fixed

• Unwanted inline images shown in rogue SPAM messages
• Deleting message from the POP3 server not working when maildir storage was used
• Message disposition flag (replied / forwarded) lost when reply or forwarded message was stored as draft and draft was sent later
• Inline images not scaled to fit when printing
• Selected text from another message sometimes included in a reply
• No authorisation prompt displayed when inserting image into email body although image URL requires authentication
• Large attachments taking a long time to open under some circumstances
• Various security fixes

Known Issues

• On Windows, "Send to > Mail recipient" does not work. Workaround: Install the Microsoft Visual Studio 2015 redistributable runtime library or the Universal C Runtime for Windows Server.
• Multiple requests for master password when GMail OAuth2 is enabled