I'm having some trouble sending mail via SMTP in Kmail. I know it isn't my SMTP settings in Fedora since the other mail program Evolution sends mail just fine.
I had the same problem when I tried installing SuSE with KDE.
I get the following error message when I try to send a message:
Your SMTP server does not support authentication.
The server responded: "Command is locally disabled"
The following transport protocol was used: