User "null" with comcast SMTP, can't send mail with Mail 3.1

it was kind of off and on, now seems permanent. When sending mail via comcast SMTP, the following error is returned: P*lease enter the password for user “(null)” on SMTP server “smtp.comcast.net”*
The mystery is how user got to be "null". Deleting the account and redoing it doesn't help. Changing port to 25 and 587 don't work. I get mail fine, just can't send. Yes, my user name is actually filled in on the accounts page. Gmail works fine...
Thanks

wierd...
blanked out my username, but Mail insists on having a username. So on a lark I put back my username with the @comcast.net domain and it worked (one test message anyway). I left the password filled in 'cuz I hate having to fill my password in every time.
So thanks for joggling the idea bank!

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