I have three outgoing servers listed. I designated number 3 as the
default. However kmail
persists in trying to use the first one listed and ends up generating
an error message. Yet if i dance between the raindrops and designate
server number three as the outgoing mail server from the file menu
(between error messages) then the message is dispatched.

Why does the first server generate an error message? Well because it
is Comcast and Comcast has some weird ways.

Kmail 1.9.4 under KDE 3.5.4, Slackware 11.0

John Culleton