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Join UsVersion 56.0beta, first offered to channel users on October 18, 2017
An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.
IMAP: When after sending a message storing that sent message fails, the message can now be stored in a local folder
When messages are composed in paragraph format, "body text" and split mail quotes are converted to paragraphs when pressing the enter key
Thunderbird now uses the latest Mozilla technology based on Rust for encoding messages
Various improvements in the Thunderbird themes on all platforms, especially for Windows 10.
Unwanted inline images shown in rogue SPAM messages
Contacts sidebar: Selection and context menu behavior
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
Blank lines removed from plain text replies under some circumstances
Large attachments taking a long time to open under some circumstances
IMAP UIDs > 0x7FFFFFFF not handled properly