If emails are getting rejected to the customers mail server saying something like "550 please turn on SMTP authentication" and they are using a cPanel as their mail server, you need to configure Email Routing to be "Local Mail Exchanger"
Emails rejected to mail server 550 turn on SMTP auth - cPanel Print
Created by: Andrew Johnson
Modified on: Mon, 10 May, 2021 at 10:43 AM
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