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Why am I getting the error "550-Please turn on SMTP Authentication in your mail client"?

When I look at my "clean mail" there are failed deliveries with the error "550-Please turn on SMTP Authentication in your mail client" found in the delivery logs.  How do I fix this error so I can receive mail?
This error is a result of a cPanel setting on the mail host.  To fix this problem, log into your cPanel, and follow the steps found in this article:

Configuring cPanel with SpamHero
last updated Jul 27, 2015
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