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cPanel's "Email deliverability" menu item reports this problem for my domain.

The system uses an alteate HELO of “s1.n2.n3.n4.static.myhostcenter.net” when sending mail from the “example.com” domain.
The system sends the domain “s1.n2.n3.n4.static.myhostcenter.net” in the SMTP handshake for this domain’s email...

cPanel appends domain name to DNS "A" records even with "." at end