?
Solved

#5.5.0 smtp;550 all relevant MX records point to non-existent hosts

Posted on 2007-11-18
2
Medium Priority
?
1,825 Views
Last Modified: 2009-07-17
We are having on and off mail problems. We have a mail server (Exchange 2000) in our domain that is receiving mail from an other mail server in the domain of our Headquarters. Our primary mail address is in the HQ domain and mail send to that address is forwarded to our Exchange server.
This worked for a long time with no problems.

Now we are getting messages that mail is being rejected with the following NDR:

 #5.5.0 smtp;550 all relevant MX records point to non-existent hosts

When they try two minutes later the mail goes through without problems.

Where do I have to start looking for configuration errors? It puzzles me that it is working 99% of the time and 1% not. Configuration is either right or wrong...or is it???
0
Comment
Question by:EVeuger
[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 Comments
 
LVL 104

Accepted Solution

by:
Sembee earned 2000 total points
ID: 20316189
That looks like a DNS issue. The sending site has issues resolving the lookups. It could be something as simple as a slow server, the lookup times out. Try again a minute later and it works because the result is cached.

Simon.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

This article lists the top 5 free OST to PST Converter Tools. These tools save a lot of time for users when they want to convert OST to PST after their exchange server is no longer available or some other critical issue with exchange server or impor…
After hours on line I found a solution which pointed to the inherited Active Directory permissions . You have to give/allow permissions to the "Exchange trusted subsystem" for the user in the Active Directory...
To show how to generate a certificate request 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 Servers >> Certificates…
This video discusses moving either the default database or any database to a new volume.
Suggested Courses

762 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