451 4.1.8 Domain of sender address does not resolve

Products

• Messaging Gateway

Issue/Introduction

Messages are queued in the Delivery queue with the status "451 4.1.8 Domain of sender address does not resolve"

Environment

Release:10.7.3

 

Cause

The destination mail server is unable to resolve the sender domain in DNS

Resolution

Ensure that the sender domain has either an MX record or an A record in the public DNS.