Avatar of John Water
John Water
Flag for United States of America asked on

email stuck in DAG queue

we are running Exchange 2013 with 3 server in a DAG. Mail was flowing fine and continues to flow properly within the severs of this DAG. I added a new Exchange 2013 server. It is Not a member of the DAG.
Mail to outside address flows properly.
Mail routed on this one new server, sent to an inside mailboxes located in the DAG, is queuing up on the DAG queue. The error message is  451 4.4.0 DNS query failed. The error was: DNS query failed with error ErrorRetry.

When I run Get-DatabaseAvailabilityGroup it resolves correctly.

I need to be able to get these mail to stop from stacking up and get delivered properly. Any thoughts?
Email ServersExchange

Avatar of undefined
Last Comment
John Water

8/22/2022 - Mon
Simon Butler (Sembee)

Can you telnet to the IP address of the other servers correctly on port 25? Confirm connectivity first.

Simon.
ASKER CERTIFIED SOLUTION
John Water

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
John Water

ASKER
this was the solution from MS premier support that worked for us.
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck