IPhone and Cox e-mail issues -- sender address not valid?

I have had an iPhone for several years and have never had a problem with e-mail and Cox internet. However, I transferred my service this week to a new address - same account information - and now my e-mail is not working correctly. Cox told me to reset my password via Webmail, and I did. I also followed the information here as to the correct set up for mail accounts. I can now receive e-mail,but I can't send e-mail. I receive the message - the sender address was invalid- and my outbox is full of unsent messages. I have everything in place according to the online articles posted here and on the Cox site. Can anyone help me correct this issue? Thanks!

What are you using for an SMTP server?
Go to Settings, Mail Contacts Calendar, Your mail account, Account Info, Advanced and look for Outgoing Mail Server.
If Cox does not permit AUTH-SMTP, set it to AT&T's mail server. Even if Cox does permit AUTH-SMTP, try using the AT&T mail server.
If that doesn't work, try resetting the phone.

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