Sending Mail to a Comcast SMTP server
Have a MAC PRO and MacBook Pro on the same network both running OS 10.8.2 with two identical email accounts having identical settings. MAC PRO email accounts work as expected; able to send and receive emails. However on the MacBook PRO, unable to send emails from either account, only receive emails. I have the same email problem when using the MacBook PRO on different networks, like a Hotel.
Consistently get an error message stating “the sender address xxx@comcast.net was rejected by the server smtp.comcast.net.”
Tried deleting the accounts, restarting and entering new accounts; reinstalled OS 10.8.2; but no difference in the problem.
Worked with several layers of Comcast support, trying all sorts of Port and SSL settings, and confirmed my password works on Comcast webmail, but cannot determine why I cannot send email from one Apple computer when the other Apple computer works as expected. All they could do is blame Apple.
What is different about the MAC PRO (early 1998) and the MAC PRO (15-inch Late 2011}?
iCal-OTHER, OS X Mountain Lion