[kmail2] [Bug 420474] Can't connect to receiving imap server

[Damian]

https://bugs.kde.org/show_bug.cgi?id=420474

--- Comment #1 from Damian <mail at 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

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