Two MX Records both with [Preference = 0]

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?
rasupportAsked:
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rasupportConnect With a Mentor Author Commented:
Not in the last few months.

Thanks Chris for your help.  
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Chris DentPowerShell DeveloperCommented:

> 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
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rasupportAuthor Commented:
Chris,  I can only connect to mx01, mx02 times out.


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Chris DentConnect With a Mentor PowerShell DeveloperCommented:

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
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rasupportAuthor Commented:
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!  
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Chris DentPowerShell DeveloperCommented:

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

Chris
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