How to fix 550 Please turn on SMTP Authentication email error in cPanel

How to fix 550 Please turn on SMTP Authentication email error in cPanel

After using transfer tool to transfer a single cPanel account from one server to another, transfer tool failed to detect the email routing settings for some of the domains, and the weirdest thing happened: no routing setting was set for the domain names.

As a consequence, all emails sent to these domains is rejected with the following error message:

Message not delivered

550 Please turn on SMTP Authentication in your mail client. mail-yw1-f48.google.com [209.85.161.48]:32858 is not permitted to relay through this server without authentication.”
550 Please turn on SMTP Authentication error

To fix this, simply head over to cPanel > Email Routing and recheck the “Auto Detect” or “Local”

Select the domain name and re-set the desired option:

After doing that the emails should start receiving normally.

Written by
Stefan Pejcic
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