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:
Sending Failed:
Your SMTP server does not support authentication.
The server responded: "Command is locally disabled"

The following transport protocol was used:
Sympatico