OpenSSL Error Email Account

Hi there.

We have an issue with the Email Account for incoming mails.
The last connection was to our Exchange Server and since upgrading to Version 4.0 the incoming mail section shows this Error Message:
Can’t use Channel::Driver::Imap: #<OpenSSL::SSL::SSLError: SSL_connect SYSCALL returned=5 errno=0 state=SSLv3/TLS write client hello>

I don´t know what to do to fix this. Could somebody help me?

Server: Ubuntu 20.04 lite Server
Zammad Version: 4.0.x

This indicates the ssl ciphers of your mail server not fitting the ones of your distribution.
I’m wild guessing with Exchange 2012 here?

TLSv1.2 by is not enabled / available on Ubuntu 20.
Ensure both systems to have the same ciphers available.

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