Cannot send mail & Connection error after 2.0

Hey guys,
I'm running 2.0 on an 8GB 2G iPhone. After updating to 2.0 in the mail app im getting two errors. The first one is "Connection to outgoing server "smtp.comcast.net" failed" and the second (when I'm trying to send mail) is "Cannot send mail. The sender address was invalid".
For the first error, I remember this being a problem when I first got the phone in January, but I cannot for the life of me remember what I changed in the settings so that it would work.
The second error is new with 2.0.
Any info or suggestions are greatly appreciated
Cheers

I am having the exact same problem. Can't send any emails. Get the message "Can't send mail. Recipient address invalid" or something like that. I have reviewed all the troubleshooting information. This did not happen until I upgraded to 2.0. I am using Edge with a pop account on an original iphone. Any help would be appreciated!!

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Cannot send mail & Connection error after 2.0

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