https://bugs.kde.org/show_bug.cgi?id=420474
--- Comment #1 from Damian <m...@dsthode.info> --- I am affected by this bug too. The file .xsession-errors show a stream of messages like the one mentioned (org.kde.pim.kimap: Connection to server lost QAbstractSocket::SocketError(13)), and the UI reports thet the connection was not successful (only once). I was working with Kubuntu 19.10, but once I installed Kubuntu 20.04 it does not work anymore. I have installed the KDE backports PPA but there is no update to Akonadi/KMail, so the problem is not solved. Debugging the connection with Wireshark I have observed that the TLS handshake stops at "Server Hello Done", no "Client Key Exhange" step ever happens, as can be seen in [1]. And as the OP said, the account can be successfully configured with Thunderbird. [1]: https://www.thesslstore.com/blog/explaining-ssl-handshake/#the-tls-12-handshake-step-by-step -- You are receiving this mail because: You are watching all bug changes.