My mail provider have both A and AAAA records for their mail server, however the ipv6 address is unreachable and then kmail failed to connect to mail server. I've to use "auto detect" in the kmail configuration menu, and it reported something like "server is not responding". I tried to use tcpdump to see what had happened and I saw response from ipv4 address and no response from ipv6 address, it seems like kmail ignored the ipv4 connection. When I disable ipv6 in network configuration to force kmail work in ipv4, everything works fine.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!