I have mysteriously newly started getting the following message in Thunderbird.
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The message could not be sent using Outgoing server (SMTP) smtp.q.com for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.
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I have not changed any settings for the Outgoing server (SMTP) in years. (The port number continues to be the Default number.)
As a possible remedy, I newly downloaded Thunderbird and then restarted my PC. No luck.
