Unable to Send Email! - Time Warner Internet

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This question is about "Unable to Send Email!", with Time Warner Cable internet and apps. I'm trying to help my mother, who has been unable to send email for about a week. Prior to that everything worked fine, and no changes have been made to account for the unexpected behavior.

The error message via Thunderbird says... "An error occured while sending mail: The Mail server sent an incorrect greeting: p-impout010.msg.pkvw.co.charter.net cmsmtp 76.77.46.130 blocked AUP#CMDNS"

So I installed eMClient, to see if it would resolve things. Nope; it gives a similar error... "Invalid server reply when connecting: 'p-impout002.msg.pkvw.co.charter.net cmsmtp 76.77.46.130 blocked AUP#CMDNS"

What in the world is going on and how can we fix it???

Unable to Send Email!?
 
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