Bookmarked https://serverfault.com/questions/595120/what-should-be-my-mx-records-for-postfix-configuration-like-for-mail-forwarding.
This postfix article about MX records may be helpful. Up until today I had no idea an MX record was required.
Author: Joseph Dickson
Joseph Dickson is a front-end web developer with experience building higher education websites using Drupal and WordPress.
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