Outgoing Mail Rejected

I have only had my MacPro for about a month and I set up my cox account through Mail. Everything worked and was great and than all of a sudden yesterday it stopped sending outgoing mail by stating:
The sender address xxxxx@xxx was rejected by the server smtp.west.cox.net.
Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be sent.
I haven't changed anything and can't figure out what is going on.

I have the same problem...I am Cox East and the problem lies with Cox. I use Microsoft Entourage on my early 09 Macbook Pro and it doesn't allow me to use the specific SMTP authentication required, but if you use Mail, it should work fine. The problem has to do with Cox not allowing you to send email from a non-Cox ip address. The link gives you the settings to set up SMTP authentication. If I am on a non-Cox network, I just use webmail. Hope this helps.
http://support.cox.com/sdccommon/asp/contentredirect.asp?sprt_cid=f53af76e-27c1- 452d-8e8f-89d899237f8e

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