thunderbird - 1:128.5.0esr-1~deb11u1 main

Thunderbird is an mail client suitable for free distribution. The goal of
Thunderbird is to produce a cross platform stand-alone mail application using
the XUL user interface language.
It supports different mail accounts, no matter of the used protocol like
POP(s) or IMAP(s), has an integrated learning Spam filter, and offers easy
organization of mails with tagging and virtual folders. Also, more features
can be added by installing extensions.
.
Thunderbird also includes an integrated calendar for handling events, events
invitations and tasks in multiple calendars. It supports local calendars,
CalDAV and plain ics files on CardDAV and WebDAV.
.
The goal of Thunderbird is to produce a cross platform standalone mail
application using the XUL user interface language.