How to verify internet configuration.


the situation was, our email was hosted on a third party, that also manage our DNS.

we install on our network a exchange 2003 server. we ask our host to change the DNS to point the mx record directly to our network.

here is the infrastructure :

INTERNET   ---   FIREWALL  ----  EXCHANGE 2003 Front (DMZ) --- FIREWALL ( SAME ) ---  EXCHANGE 2003.

here is what happen, for outside person, we do not receive everything, we receive, we don't receive,
we can send to everybody.

I check the firewall for spaming, it's off.  AntiVirus is off,  In exchange, DNS check is not selected on both server.

what I suspect is that our host did not modify properly the dns and is relaying the message.  

so I whant to verify our DNS over the internet to check for the MX record.

how can I achive that ?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
You can also use NSLOOKUP from the command line to check this.  The easiest thing is to have several people you know who are in geographically disperse areas, and who have different ISPs use NSLOOKUP to determine what they're seeing for your MX record.  If this isn't an option, you can use NSLOOKUP locally and change your default server so that you're using someone else's DNS Server for the lookup...unfortunately, many ISPs are restricting the use of their DNS Servers to clients in their IP Spaces.  There are still a few DNS Servers out there you can just have to do some trial and error to find them.

Syntax for NSLOOKUP can be found here:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.