Emails getting stuck in queue, Reverse DNS check intermittenly failing

Hi All,

I use a spam filter called MX Logic that sits outside of my domain, and therefore send and receive mail from different servers. Because of this, I have PTR records setup for my outgoing mail servers to point back to my domain. Currently, if I go to mxtoolbox.com and type in my domain name, I green lights for everything (including the Reverse DNS Check). Last week though, the Reverse DNS Check was failing, and emails to cfl.rr.com (RoadRunner in Orlando) were getting stuck in the queue.

The thing is, nothing has changed in my Exchange configuration or at my ISP (as far as I know). This happens from time to time. What would cas a Reverse DNS check to intermittently fail?

I have attached my current test from mxtoolbox that shows all green lights.

Thanks,
Bob
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ob1_Asked:
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ob1_Author Commented:
I had to enable DNS forwarding for my Exchange server, and enter some external DNS servers provided to me by my ISP.
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markpalinuxCommented:


There are dns server's which service the reverse dns checks, maybe one of them has bad info? While I do not think it is likely seems quite possible.

http://postmaster.aol.com/tools/rdns.html

I would try to find out what dns server service that reverse lookup zone and query them each specifically to see they have the same info for your ptrs.
http://network-tools.com/

Mark
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ob1_Author Commented:
Thanks mark, what do you mean by "reverse lookup zone"?

Do you just mean my own DNS servers for my domain or something different?
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