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

[Damian]

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

--- Comment #3 from Damian <mail at dsthode.info> ---
Hi Panagiotis, sorry for the late response but I didn't see your reply.

I've found the root of the problem. I configured the outgoing mail server to
try and send a message but it failed again with the same symptoms in Wireshark,
only that this time I had an error pop-up with the following error code from
OpenSSL: "141A318A:SSL routines:tls_process_ske_dhe:dh key too small".

I turned to Google and the first answer was [1] which explained that on 20.04
the minimum security level on OpenSSL was raised, thus the error message.

I followed the suggestions in the answer and now I'm able to send and receive,
so it's not really a problem with KMail, but with the default configuration of
the OpenSSL library in Ubuntu 20.04.

1:
https://askubuntu.com/questions/1233186/ubuntu-20-04-how-to-set-lower-ssl-security-level

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