Thunderbird
Hi.... I had Thunderbird 62 version. We have exchange 2013 consists of 4 servers: 2 transports, and backend and frontend. We got a problem after our Thunderbird was updated to last 78 version. Now we can not resieve and send emails ....
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Good to hear all is now ok. Could you please select my previous comment as a 'Chosen solution' so this helps others when searching for help.
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One of the major changes in update to 78 was the minimum TLS level that is set as default. https://www.thunderbird.net/en-US/thunderbird/78.0/releasenotes/ If your server is not using the up to date TLS protocols then this will stop connection to and from server.
Please try the information at the following link to reset the minimum to same as used in versions prior to 78 and then restart Thunderbird. https://support.mozilla.org/en-US/kb/thunderbird-78-faq#w_after-upgrading-to-thunderbird-78-i-cannot-receive-or-send-email-messages
Image as guide to find 'Config Editor' using 'search' in Options
Alternative - do not use search - select 'General' in left pane and scroll all the way down to the bottom.
Змінено Toad-Hall
Оk. Thank you very much. Now It works correctly.
Вибране рішення
Good to hear all is now ok. Could you please select my previous comment as a 'Chosen solution' so this helps others when searching for help.