troubleshooting Question

Exchange2010 SP3 UR7 Queue Viewer many messages type DnsConnectorDelivery 451.4.4.0 primary target ip address responded 421 4.2.1 unable to connect

Avatar of amanzoor
amanzoorFlag for Canada asked on
16 Comments1 Solution1515 ViewsLast Modified:
Hi there,
Running Exchange2010 SP3 UR7, have many messages sitting in the queue of type DnsConnectorDelivery 451 4.4.0 primary target ip address responded 421 4.2.1 unable to connect.  

The general and recepient tab of one of the message please note mydomain=my real domain name:

Identity: EXCHANGE3\402697\1840962
Subject: Undeliverable: Re: You have a $50 CVS reward waiting for you
Internet Message ID: <>
From Address: <>
Status: Ready
Size (KB): 6
Message Source Name: DSN
Source IP:
SCL: -1
Date Received: 12/2/2014 11:12:51 AM
Expiration Time: 12/4/2014 11:12:51 AM
Last Error: 400 4.4.7 Message delayed
Queue ID: EXCHANGE3\402697
Recipients:;2;2;400 4.4.7 Message delayed;0;CN=Internet Mail SMTP connector Exchange3,CN=Connections,CN=Exchange Routing Group (DWBGZMFD01QNBJR),CN=Routing Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=My Domain,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=mydomain,DC=com

The recipient information:        ready    400 4.4.7 message delayed

Can someone please help me in identifying what is going on with my exchange, my antivirus is fine, filtering is fine running Sophos pure message.  Is my exchange sending spam? how and where can I block it?  Need help please.

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 16 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 16 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros