https://bugs.kde.org/show_bug.cgi?id=437717

Jan Kundrát <j...@kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOT A BUG
             Status|REPORTED                    |RESOLVED

--- Comment #1 from Jan Kundrát <j...@kde.org> ---
Trojita uses Qt which uses OpenSSL as the TLS backend, and by default I believe
it's going to use systemwide crypto policies. The error that you're getting
comes back from OpenSSL, and unless I'm mistaken, it means that your IMAP
server is using a crypto configuration that your operating system considers to
be too weak. And indeed:

$ openssl s_client -connect imaps.bluewin.ch:993
...
Server Temp Key: DH, 1024 bits
...

That has considered insecure in Fedora's config since Fedora 33:
https://fedoraproject.org/wiki/Changes/StrongCryptoSettings2

My suggestion is to report this to your e-mail provider. As a workaround, you
might want relaxing the crypto preferences (see that Fedora page for help).

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