Solved

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

Posted on 2007-11-18
2
1,781 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 500 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

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Learn to move / copy / export exchange contacts to iPhone without using any software. Also see the issues in configuration of exchange with iPhone to migrate contacts.
Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
To show how to create a transport rule 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 >> Rules tab.:  To cr…
To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

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