Thunderbird + Dovecot 2.4: Disconnected: Too many invalid IMAP commands

If you try to connect Thunderbird (I’m using 128.13.0esr while writing) with Dovecot 2.4.x (while writing I’m using 2.4.1), chances are high you are getting a 

Disconnected: Too many invalid IMAP commands.

in the Dovecot log.

Someone had the same problem, also reported at the Thunderbird Bugzilla.

It seems, a fix for Dovecot is written, but not yet released. Until then you could change two configrations in Thunderbird to connect successful to Dovecot:

1. In Thunderbird open „Preferences“, „General“, scroll down to the bottom and click „Config Editor“.
2. Set mail.server.default.allow_utf8_accept to false
3. Set mail.imap.use_literal_plus to false
4. Restart Thunderbird

After that, I was able to use Dovecot with Thunderbird.

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