550: Cannot accept mail for this host; MX records will cause loop.

Severity

Recoverable error.

Explanation

The SMTP server sends this message to the client showing that the local host cannot accept mail for the local host because the CheckHomeList procedure has determined that accepting mail exchange records would cause a looping mail condition.

System action

SMTP continues.

System programmer response

Determine what MX records are stored in the domain name server and why they are causing a loop. Tell the domain name server administrator about the error.

Module

SMTPRES

Destination

ProcessRQR

Parent topic: SMTP reply code messages