Solved

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

Posted on 2007-11-18
2
1,562 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
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

Do email signature updates give you a headache?

Do you feel like all of your time is spent managing email signatures? Too busy to visit every user’s desk to make updates? Want high-quality HTML signatures on all devices, including on mobiles and Macs? Then, let Exclaimer solve all your email signature problems today!

Join & Write a Comment

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
This article explains in simple steps how to renew expiring Exchange Server Internal Transport Certificate.
In this video we show how to create a Shared Mailbox 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 Recipients >> Sha…
In this video we show how to create an Address List 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 Organization >> Ad…

758 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

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now