Download Mozilla Thunderbird 91.9.0

The Mozilla Foundation has released version 91.9.0 of Thunderbird. Thunderbird is an open source client for e-mail and newsgroups, with features such as support for various mail and news accounts, a spam filter, spell checker, and a customizable appearance. In version 91 has included a warning when an email is sent to a potentially non-existent address, or if there are too many addresses on the public address line. There is also support for CardDAV and a native client for a Mac equipped with an Apple Silicon processor. The following changes and improvements have also been made in this release:

changes

• A warning is now displayed if an OpenPGP key has unsafe attributes that are ignored; see support article†

Fixes

• OpenPGP integration in Thunderbird 91.8.0 and 91.8.1 did not allow SHA-1 key signatures
• macOS disk image graphics updated
• CalDAV calendars were marked read-only on startup
• Task creation field on macOS incorrectly displayed a search icon
• Various security fixes