Solved

Two MX Records both with [Preference = 0]

Posted on 2009-05-13
6
1,389 Views
Last Modified: 2012-05-06
We keep getting delay notices and then failures when our users are sending to one domain in particular.  

I looked up the DNS info on the domain  and got the following:

blahblah.net.      MX      IN      86400      mx01.blahblah.net. [Preference = 0]
blahblah.net.      MX      IN      86400      mx02.blahblah.net. [Preference = 0]

Preference = 0 means that it has the highest priority.

What happens when you have two that are set to the highest priority?   Could this be causing the delay/failure notices.

We are running exchange 2003 sp2.   Is there anything I could do on my end get it to go though?
0
Comment
Question by:rasupport
[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
  • 3
  • 3
6 Comments
 
LVL 71

Expert Comment

by:Chris Dent
ID: 24373951

> What happens when you have two that are set to the highest priority?  

It's load balanced over all servers of equal priority. Typically message 1 goes to mx01, message 2 to mx02, and so on.

Are you able to connect to both servers? "telnet mx01.blahblah.net 25"?

Chris
0
 

Author Comment

by:rasupport
ID: 24374011
Chris,  I can only connect to mx01, mx02 times out.


0
 
LVL 71

Assisted Solution

by:Chris Dent
Chris Dent earned 500 total points
ID: 24374038

That certainly won't help. Lets see if it's a problem on your end or theirs...

Head here and pop the mail server name in the box:

http://www.mxtoolbox.com/diagnostic.aspx

If that can't connect either then it suggests a problem on their end.

With one failing it should use the other MX record and connect to that. I wonder if that's reliable...

Chris
0
IoT Devices - Fast, Cheap or Secure…Pick Two

The IoT market is growing at a rapid pace and manufacturers are under pressure to quickly provide new products. Can you be sure that your devices do what they're supposed to do, while still being secure?

 

Author Comment

by:rasupport
ID: 24374127
response from mx01 came back with:

Transaction Time:         12.031 seconds - Not good!

(the other tests passed)


and mx02:

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond x.x.x.x

I'm guessing it's something on there end...

Great site by the way, thanks!  
0
 
LVL 71

Expert Comment

by:Chris Dent
ID: 24374171

Yeah, I'd say it was. I guess you don't have problems delivering to anyone else?

Chris
0
 

Accepted Solution

by:
rasupport earned 0 total points
ID: 24374194
Not in the last few months.

Thanks Chris for your help.  
0

Featured Post

Technology Partners: 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

Most DNS problems are VERY easily troubleshot and identifiable if you can follow the steps a DNS query takes. I would like to share the step-by-step a DNS query takes from the origin to the destination. _____________________________________________…
I wrote this article to explain some important DNS concepts that should be known to avoid some typical configuration errors I often see in forums. I assume that what is described here is the typical behavior of Microsoft DNS client. I don't know …
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…

617 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