Outlook not sending mail all of a sudden - Time Warner Internet

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This question is about "Outlook not sending mail all of a sudden", with Time Warner Cable internet and apps. For many years my Outlook has worked with no problem. All of a sudden I can't send mail, it gets hung up in the outbox. And this error prompt pops up when trying to send: "Your outgoing (SMTP) e-mail server has an internal error. If you continue to receive this message,
contact your server administrator or Internet Service Provider (ISP). The server responded: 554 cdptpa-cmomta01 cmsmtp ESMPT server not available."
Nothing has changed, I don't know why all of a sudden I can't send. Anyone know how to fix it? Thank you!!

Outlook not sending mail all of a sudden?
 
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