I just migrated to OpenSUSE Tumbleweed from Ubuntu. I used Thunderbird in Ubuntu, but wanted to go native KDE in Tumbleweek. Kmail did a great job importing emails and accounts from Tbird. After cleaning up all the little details, I thought everything was working great until I tried to send a message. Kmail returned the following error:

Failed to transport message. An error occurred during authentication: SASL(-4): no mechanism available: No worthy mechs found

I have checked the SMTP server settings and all seem fine. I tried using several different accounts with different SMTP servers, all of which require authentication, but nothing worked. I even had Kmail autodetect the server settings, and that seemed to work fine, but still no success. I installed Thunderbird and it works fine. I actually prefer TBird because of its unified inbox, but I want to use the Kcontact system now. Any ideas?