It's happening again...trouble sending email when using 3G

I had this problem in the past...probably over a year ago and it seemed to resolve itself on its own. Cox is my isp so I'm sure that has something to do with it.
when trying to send email over wifi from home, it's great. But switching to 3G, out of the house, I seem to have problems. I get the message "The sender address is not valid". Now the weird part is if I go into settings and turn on SSL, it MIGHT send after that...but it doesn't happen all the time. Sometimes, I'll turn SSL on...then go back and turn it off again and mail will send. Then sometimes, neither works. Is this a known issue?
I recently upgraded to 3.0 on a 3G. That's when the problem came back.
Message was edited by: Jovi Guitarist

Hi,
my problem seems to be solved very easy. It seems, that Aplle switch off the servers on mac.com (wich was used for me.com), without any annocment :-))) But MobileMe configuration still was the same like at the beginning and it use mac.com servers
I deleted MobileMe account on my iPhone and after thet add once again.

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