My wife's computer stopped sending her emails with this rejection message:
The message could not be sent because the server rejected the sender's
e-mail address. The sender's e-mail address was '------'. Subject "ben",
Account:'mail.comcast,net',Server:'smtp.comcast.ne t',Protocol:SMTP,Server
Response:'5505.1.0 Authentication required',Port:25,Secure(SSL):No,Server
Error:550,Error Number 0X800CCC78.

What do I do to get her working again?


and Error Number 0X800CCC78. She uses OE 6 and everything worked fine
until today.