Solved

Help! Emails are being delayed both internally and externally after adding new Exchange servers

Posted on 2013-06-11
2
536 Views
Last Modified: 2013-06-11
Hello,

This is an urgent issue... We currently have one Exchange 2010 server doing CAS, Hub, and MBX roles. We decided to integrate a new Exchange servers into our environment, without doing anything to the existing server. We created a CAS Array and assigned a SSL cert to the machines, created a MBX DAG with two more servers and load balanced the traffic via Zen. Suddenly everyone on the original Exchange server is getting "Delivery is delayed to these recipients or groups."

We've had these machines operational for over a week and just began doing the SSL cert addition, load balancing the past day, and autodiscover the past day. We used completely different certs and urls:

Original SSL: email.contoso.com
New SSL: mail.contoso.com

Original redirect: redirect.contoso.com
New redirect: redirect1.contoso.com
0
Comment
Question by:jmichaelpalermo4
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 3

Author Comment

by:jmichaelpalermo4
ID: 39240003
Getting an error on the CAS / Hub servers:

451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain
0
 
LVL 3

Accepted Solution

by:
jmichaelpalermo4 earned 0 total points
ID: 39240025
Found the issue - I had set an external DNS on the CAS/Hub servers to 8.8.8.8 - We needed to set both DNS to internal
0

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

As tax season makes its return, so does the increase in cyber crime and tax refund phishing that comes with it
Preparing an email is something we should all take special care with – especially when the email is for somebody you may not know very well. The pressures of everyday working life stacked with a hectic office environment can make this a real challen…
In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Mail Flow…
how to add IIS SMTP to handle application/Scanner relays into office 365.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question