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Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.
Join UsVersion 54.0beta, first offered to channel users on June 2, 2017
Better support for Charter/Spectrum IMAP: Thunderbird will now detect Charter's IMAP service and send an additional IMAP select command to the server. Check the various preferences ending in "force_select" to see whether auto-detection has discovered this case.
Individual feed update interval.
Thunderbird now uses Mozilla's latest proxy technology (add-on FoxyProxy now supported).
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.
Attached message sometimes not saved or forwarded correctly.
Mailing list (group) not accessible from macOS or Outlook address book(not working in Thunderbird version 52).
Multiple requests for master password when GMail OAuth2 is enabled.
Chat working again (fixed in Thunderbird version 54 beta 2, wasn't working in beta 1).
Clicking on links with references/anchors not working, clicking on links with references/anchors where target doesn't exist in the message not opening in external browser (fixed in Thunderbird version 54 beta 3, wasn't working in beta 1 and 2).
Large number of blank pages being printed under certain circumstances when invalid preferences were present (fixed in Thunderbird version 54 beta 3).
Messages sent via the Simple MAPI interface are forced to HTML.
Calendar: Invitations can't be printed.