Kmail authentication for Earthlink

I just got notice from earthlink that they are going to encrypted mail service. Of course they say absolutely nothing about using any mail client other than windows stuff. So I try to setup for the authentication by gleaning info from their instructions for Eudora, Netscape, etc. Unfortunately I cant get anything sent via their servers. My setup is for the smtpauth.earthlink.net server using TLS and CRAM-MD5 but no matter what I do I get an error 535 saying cant get authorization.During the setup I let Kmail determine what the server will accept and it says, TLS & CRAM-MD5. Does anyone have any suggestions on what I may be doing wrong? Richard