Mac mail on Macbook pro not sending email suddenly

OS X 10.6.8
Mac mail was working up to yesterday.
NO changes to the box or mail.
Mail will receive but not send mail; alerts with an smtp error.
Installed Thunderbird, same problem.
Mac mail on an iMac, works fine.
Thunderbird on Win Vista works fine.
pop and smtp settings are identical on all boxes.
Turned off the firewall on the laptop - no joy
Searched and have killed/rebuilt the keychain several times.
Confirmed password is correct
I have not killed and recreated the mail account; if that actually works, let me know and I'll try again.
I have rebuilt the mailbox - no joy.
Ran the diagnostics and green lights on both pop and smtp so it seems that logins are working, just can't send mail.
Any suggestions? Is there any reason that mail would stop working on the laptop but continue working on the desktop? I'm not a Mac guy so I've run out of options and any pointers would be appreciated.

"Note all the settings on the functional Mac and then transfer them to the non-functional one."
That'd be the problem. I've checked and double checked the settings/configuration; even went over them with my wife reading one set and me the other - everything matches. So, I'm making the assumption that we're missing the forest for the trees and it's something totally stupid like a swapped set of letters or an L for an I kind of thing. In order to totally eliminate these kinds of S.U.E.'s, I'd like to move a copy of the files that are the actual config from the working machine to the non-functional machine.
Since OSX is basically BSD, I'm kind of making the assumption that all the important stuff is stored in config files; I just have not been able to figure out which files and where they live.
Keep in mind that the laptop went toes up without anyone making any changes so I'm not totally convinced the issue is a typo. I've searched for other reasons a system would stop sending mail and am not getting any hits that are meaningful. If anyone has any ideas, let me know.
TIA

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Mac mail on Macbook pro not sending email suddenly

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