SMTP Server Offline

Hi all, OS X 10.8.3:
For some time, through several OS upgrades, Mail.app has been unable to create iCal reminders from appropriate date/time data. Not only does the reminder fail to appear in iCal, but Mail behaves bizarrely afterwards, necessitating quit and relaunch.
But now I have a much more annoying problem. I am told "SMTP Server offline". Initially, I assumed it was a temporary problem at my ISP's end. But then I realized that the oher Mac - on the same network - can still send.
Restart makes no idfference. DFA and Repair Permissions report no problems, while Techtool Pro finds hundreds of "bad" files.
Console generates this error message every 10 minutes... is there a clue here?
"16/04/2013 9:40:08.050 AM Mail[222]: [<_LibSasl2SASLClient: 0x7fb2dd8241b0> mechanism: PLAIN security layer: no] Failed to start the SASL connection
SASL(-1): generic failure: "
Thanks.

I have found the solution.
One of the settings under Mail.app's Preferences, Accounts, Advanced pane is "Use SSL?" This must be left UNchecked for my ISP. The confusing thing is, it WAS left unchecked.
I had a new email being composed, and decided to open the pull-down SMTP List at the bottom of the email dialog's header. I selected "Edit SMTP List" and then highlighted the troublesome entry. Under the Advanced tab, was the setting "Use Secure Sockets Layer (SSL)" and it was selected!
I.e. despite being set to OFF in the Preferences dialog, it was ON in the "SMTP List" dialog.
This would seem to be a bug. Anyone know how to report this to Apple?

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