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DNS Report shows Failure trying to contact our mail server

Posted on 2008-10-02
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Last Modified: 2012-05-05
As of last night we have been having outgoing mail delays with error 4.4.7 and incoming mail is taking a lot longer than usual. I have made no changes to our system that would cause this disruption. I ran a DNS Report and got this information.

http://private.dnsstuff.com/tools/dnsreport.ch?domain=eaglecreeksiding.com&token=17e0156f4644ac292cf05f8a0f629019 

It tells me it failed trying to connect to our mail server. Our server is 66.224.146.146 and we have 2 domains, eaglecreeksiding.com and nwbuilt.com.

I am not sure where to begin with trying to trouble shoot this problem. Thanks.
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Question by:eaglecreek
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Expert Comment

by:Erik Bjers
ID: 22631648
Make sure there is an MX record in your DNS for each domain.

eb
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Author Comment

by:eaglecreek
ID: 22635021
There is an MX record in each Domain. What should I try next?
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by:eaglecreek
ID: 22635278
Here are some screen shots from our mail server and some more info. This was all done prior to my arrival and has been working fine until a few days ago when we started to see delays. Then when I ran the DNS Report I saw the "Failed" when trying to contact our mail server, so naturally I'm a little wary.

The MX record is set to same as parent for the server "eaglecreeksiding.com.corp"

The FQDN is set to "mail.eaglecreeksiding.com"

Mail is still flowing in and out but with delays here and there. I just want to nail this issue down.

Thanks for all the help.
ipconfig.jpg
MXrecord.jpg
FQDN.jpg
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Erik Bjers earned 500 total points
ID: 22641310
The only thing I see wrong so far is that your mail server is looking at external DNS servers, it (and all other computers on the network) should only look at your internal DNS servers.  Your internal DNS servers should be configured with root hints or forwarders to resolve external records.

Correct the DNS problem and you may see a speed up in the mail.  Also check your external DNS to make sure the MX records are correct and if you have a router/ firewall or other device that forwards traffic to your mail server check it's logs for anything indicating a delay

eb
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Author Comment

by:eaglecreek
ID: 22674318
So it looks like the culprit in this issue was our spam filter (Deep Six device) that is causing the delay. We have a 1:1 NAT forwarding all mail through the spam device and then onto Exchange. I pointed the 1:1 NAT to our Exchange server bypassing the spam device and now flies in and out with no delay. I will have to see why the spam device is having problems but at least we are sending receiving emails in a timely fashion.
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