dsn=4.0.0, stat=Deferred: 421 MAIL FROM: host must resolve (Errors & Solutions #12)

Error

May 01 00:19:33 xyz sm-mta[7922]: p4DMJG4s007920: to=, delay=00:00:17, xdelay=00:00:17, mailer=esmtp, pri=120627, relay=mail.hosting.com [192.241.148.0], dsn=4.0.0, stat=Deferred: 421 MAIL FROM: host must resolve

Solution

Your FROM email domain should be resolvable by the target mail server

I changed

noreply@localdomain.com
to
noreply@internetdomain.com

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