Why it thunderbird 78 hanging when talking to IMAP mail server?

user_966365 0
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After automatic update from thunderbird 68 to 78, thunderbird hangs in talking to our organization's email server. Why is this happening?

thunderbird imap ssl
2 Answers

The hint came to our sysadmin from https://help.blacknight.com/hc/en-us/articles/360011553098-Issues-with-Thunderbird-78-.

It turns out that starting with thunderbird 78, mozilla disabled TLS1.0 and TLS1.1. Our mail server is old and not updated.

The link above shows how to use config editor, specifically

  1. Go to options
  2. Scroll all the way down to Config editor...
  3. Accept the risks
  4. Search for security.tls.version.min
  5. Set it to 1.
  6. Restart thunderbird.
user_9663650

A million thanks for this. Problem solved. (Was on the verge of telling folks that Thunderbird was FUBAR and we'd have to migrate to Evolution.)

Antique mailservers must be quite common for restricted use on small intranets. In our case as a mail archive store. It's just a place to move mail messages to, because some people want to store gigabytes of them locally.

user_52469060
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