MX Server Bounce backs

This article relates to 123-reg Email

123-reg's servers are configured to check to see if email is coming from a Smart Host server, this means that we check that the server we are receiving the email from is authenticated to send email as coming from that domain.

Example: If you were to send an email from through the SMTP server, to a domain using our servers we will check if is authorised to send through If the domain is authorised to send through the server we will accept the email, if however the email hasn't gone through a Smart Host server and came from an Open Relay server we will block the email, as this method is widely used by Spammers.


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