SMTP error 421 frequently occurring on emails sent to rochester.rr.com - Time Warner

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SMTP error 421 frequently occurring on emails sent to rochester.rr.com - Time Warner

This question is about "SMTP error 421 frequently occurring on emails sent to rochester.rr.com", with Time Warner Cable internet and apps. This sort of occurrence is happening all too often. An email is sent to a small group of recipients (
 

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