I am facing an issue with a client who is using our mail server as a secondary backup for his email.
His primary email is set on office 365, so when this client sends email from his primary email to any email in our server, our server rejects his email.
He receives this error:
Your message to alaa@***.com couldn't be delivered. |
***@*** is not authorized to relay messages through the server that reported this error. |
So, i guess the issue from the SMTP IN, and the setting i have is as follows:
Allow Relay:
Only Local Users
So would change this helps?
Also, i have found an option in the Domain Name options in the Email section called
Inbound Message Delivery:
External (Use MX Record) [This is my setting]
Still, i get the error.
Did anyone face such an issue?