Thunderbird 91.4.1

Thunderbird

Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

Thunderbird 91.4.1 fixes:

Attachments that should open in Thunderbird, such as ICS attachments, offered to save the file instead
Saving attachments from IMAP accounts where usernames contained special characters failed
Temporary files created for forwarded attachments sometimes had the wrong extension
S/MIME signatures were shown as invalid by Outlook
URL input boxes on content tabs erroneously displayed a search glass icon on macOS
Message bars (such as content blocking) did not use high contrast theme colors
Some messages with autocrypt headers loaded slowly, causing Thunderbird to hang
Server hostnames were cut-off in the account manager
Account Setup did not support non-ASCII characters in passwords
Account Setup did not always retain set values
Virtual folders did not retain folder selection when a folder name contained non-ASCII characters
Messages saved as "html" or "eml" did not include message headers
"Private web page" field was not included when exporting a contact to a vCard
Addons were still active after restarting Thunderbird in troubleshooting mode with "disable all addons" checked
FileLink attachments did not always display the FileLink provider's icon
FileLink privacy notifications persisted in the compose window after removing all FileLink attachments
"Loading" icon remained after a FileLink upload failed
Lengthy event names for multiday events did not wrap
Various theme and UX improvements
Various security fixes