What’s New

1. OpenPGP key properties can print debug information to the Error Console
2. External browser login flow enabled for Yandex
3. Custom OAuth support for issuer ID and client secret field for IMAP and POP3
4. Custom OAuth support for POP3
5. Enterprise policy DisableUpdateSettings prevents users from changing update settings
6. Enterprise policy DisableDataCollectionSettings prevents users from changing data collection setting
7. Enterprise policy DisableMessageForwardingFilters prevents message filters from automatically forwarding messages

https://www.thunderbird.net/en-US/thunderbird/156.0/releasenotes/?uri=/thunderbird/releasenotes/&locale=en-US&version=156.0&channel=release&os=WINNT&buildid=20260910221217