Mail cannot "send", connection doctor gave green light, smtp data ok (?)

This is a real mystery... Hopefully somebody can help us!
We already checked the SMPT with the Connection Doctor and we got a green light. Data is OK. But it still doesn't send.
When checking advanced settings, below "In use by account" is blank. (?) Cannot put data on there. SMTP appears (null) but with correct info, and again, Connection Doctor gave us a green light!! So? What is wrong with this account?
Other mac computers on the same network send and receive from and to the same ESP-ISP just fine.
Other info: Mail version 4.2, OSX 10.6.3.

When checking advanced settings, below "In use by account" is blank. (?) Cannot put data on there.
That is an indicator field which displays the account associated with the particular SMTP server within the list. This can be changed from selecting the SMTP Server from: Mail >>Preferences >>Accounts >>Account Information, then select from the pull-down menu for "Outgoing Mail Server(SMTP):" Make sure you save it.
As for the sending issue I would need more info. Similar to your Incoming Mail Server, does your SMTP server require authentication? Connection Doctor will show a green light for your SMTP if you have the SMTP Advanced Settings >> Authentication: set to none, BUT the mail server won't send the mail until the request passes the authentication process (changing the authentication settings to Password or the appropriate method will correct this).
However, with the information provided I can't pinpoint the problem. (What does Connection Doctor say after the green light? Do you use SSL?)

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