


Fixed an issue that caused Thunderbird to stall after sending messages with NNTP and SMTP recipients.

Added support for non-UTF8 news groups.Fixed an issue that caused the forwarding of messages with attachments to fail sometimes.Thunderbird failed to send messages when an IP address was configured as an IPv6 SMTP server (and not a hostname).Here is the remaining list of changes in the new version of Thunderbird: Thunderbird installations with multiple language packs will also see improvements, as the engineers fixed an issue that caused high RAM and CPU usage resulting in a "sluggish performance". Installations with "a multitude of folders" will see improved startup performance after the installation of the new version. Thunderbird 91.4.0 improves the performance of the email client in several scenarios.
