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 Post subject: ERROR - SMTP Reverse DNS Mismatch
PostPosted: Tue Jun 25, 2013 8:34 pm 

Joined: Tue Jun 25, 2013 8:18 am
Posts: 0
Hi,

I receiving this alerts showing intermittenly for my 2 dns. Can I know what cause this thing happen?


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 Post subject: Re: ERROR - SMTP Reverse DNS Mismatch
PostPosted: Wed Jun 26, 2013 7:05 am 
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Joined: Tue Dec 30, 2008 2:51 pm
Posts: 276
Location: Austin, Tx
Please post or email me the domain or IP address that you are monitoring and I would be happy to look into it for you.

Peter@mxtoolbox.com

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Peter LeBlond
MxToolBox
Product Development Engineer
peter@mxtoolbox.com


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 Post subject: Re: ERROR - SMTP Reverse DNS Mismatch
PostPosted: Thu Jun 27, 2013 6:53 am 
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Joined: Tue Dec 30, 2008 2:51 pm
Posts: 276
Location: Austin, Tx
I just looked at your Reverse DNS and everything here looks perfect. When I looked at your monitors the event history shows that they keep going down with these errors

Quote:
Unable to Connect to SMTP Host
DNS Resolution Failed


It is my guess that your network is going down and so we are unable to reach your DNS servers that you are hosting yourself. Each of our lookups will attempt to resolve your DNS from the root so that we can detect any DNS problems.

You can confirm this by changing your monitors to use the IP's directly instead of the hostname. If I am correct, they will continue to go down on the monitors, but it will only have "Unable to Connect to SMTP Host" and the "DNS Resolution Failed" will go away. If this is the case, I would suggest that you have at LEAST secondary DNS servers that are hosted for you.

You can see this warning if you run a DNS check against your domain here: http://mxtoolbox.com/DNSCheck.aspx

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Peter LeBlond
MxToolBox
Product Development Engineer
peter@mxtoolbox.com


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