Cannot Send Mail  Sender Address Rejected by server (Mac Mail)

I am getting this message whenever I try to send mail using MAC mail though my cable provider (COX). It has just started. I can send mail fine from a PC on my network and via at ATT wireless card. But not via cable. I have tried all the obvious things and many things discussed in the forum including:
- Run disk warrior in case there was a file problem
- Delete user info from cox account
- Reset modem and router
- Change outgoing port
- switched from wifi to Ethernet connection
In talking to COX, they say they seem to have some undocumented incompatibilities with Mac mail that appear to be intermittent. He said this is common problem.
I have had this problem one other time and resetting the modem seemed to fix the problem.
Anybody find a permanent solution to this problem.

Well I think I solved it. It appears that the outgoing server information dissapeared. The outgoing mail menue is hard to find go to preferences/accounts.
At the bottom of the page is a pull down menu of different outgoing servers. One of the options is edit. Select this. While my COx account was there the information was no longer there. Filled it in again and everything worked fine.
I must say it took me a while to find where I could adjust the outgiong mail server. Very poor design on Apple's part!

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