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 [email protected] 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}?

What was the SMTP error?
Comcast has messed up their outgoing server somehow.  I got a message about "The sender address [email protected]" was rejected by the server smtp.comcast.net." This of course is absurd, since YOUR E-mail address has nothing to do with sending mail.
If that's the problem, you're going to have to call Comcast and repeatedly escalate the case until you can find someone with even a basic understanding of how E-mail works.  I had to get a "supervisor" involved, and this person was still so ignorant that she had to call me back the next day after "researching" the problem and still proposing asinine attempts to resolve it.  And it never did get fixed, by the time I left the location at which I needed to use Comcast.
You need to insist that your reply-to address is irrelevant for sending E-mail.  If you're connected directly to Comcast's network (which you are when you're connected through your cable modem), you should be able to send through their SMTP server.  Period.  That's how Time-Warner and Verizon work, for example.  The first thing you're going to hear is "Well, you're not using your Comcast E-mail account."  IRRELEVANT.  And why would anyone use the obscure Comcast-assigned E-mail address in 2013?
Good luck.

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