Whether you use Thunderbird as your primary mail app, or as a backup for a web based mail service, it has some great built-in features and is also very extendible through 3rd party add-ons.
Some new changes:
* Native support for macOS devices built with Apple Silicon CPUs
* Thunderbird now operates in multi-process (e10s) mode by default
* Encrypt mail to BCC recipients (with warning that it will expose the recipients in the list of keys)
* CardDAV address book support
* OpenPGP: Added config option to disable encrypting saved drafts
See
Thunderbird — Release Notes (91.0)#
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thunderbird
Version 91.0, first offered to channel users on August 11, 2021 Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla Thunderbird version 91.0 is only offered as direct download from thunderbird.net and not as an upgrade from Thunderbird version 78 or earlier...
