Thanks for testing on your end, Christian.

I've did the same and can confirm that it works without any issues with
default packages and default configuration files.

I've played around a bit more with the (identical) configuration files
(of both 14.04 and 18.04) and noticed, if I comment out the
"ssl_protocols" directive ("#ssl_protocols = !SSLv2 !SSLv3") then it
TLSv1.2 is offered without any issues. As soon as I enable it again,
only TLSv1.0 and TLSv1.1 is available.

So I am certain this is somehow a configuration issue and not a software
bug/issue.

Again thanks for reproducing on your end.

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https://bugs.launchpad.net/bugs/1836180

Title:
  TLS1.2 and newer not available in dovecot

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