SMTP Relay Authentication Error

pasayev

New Member
Oct 12, 2025
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0
1
Hello,
I configured PMG in Cpanel for inbound email filter. I get following error when send an email.

Diagnostic-Code: smtp; 550-Please turn on SMTP Authentication in your mail
client. 550-domain.tld [xx.xx.xx.xx]:45482 is not
permitted to relay 550 through this server without authentication.

What should I do? Thank you.