Not receiving emails to Exchange:(

May 11, 2009 at 04:36:32
Specs: Windows 2003, Core 2 duo/2GB ram
Okay, I've been at this for 2 weeks now and I can't for the life of me figure out what's going on. I've read forums, tried and tested...still nothing.

This is my configuration:

I have a NAT server, an Exchange server and an Xp machine. All on the same domain. I've also got my own domain which I've bought (the name is different than the network domain).

Seeing as I've got a dynamic IP address, I also signed up with and use their Dynamic DNS service. I've configured everything to point to my external IP address. I made sure that the recipient policies in Exchange are set to the domain name which I've bought.

So far, I can send emails out from Outlook on the Xp machine. When I try to email a user, i get a bounceback.

Now, I've made sure that I can see the server publically by attempting to telnet to it through port 25. It creates a connection no problem. I haven't tried sending an email though from telnet, but what I do see is that the public IP and the server are viewable on the internet.

Could it be that the Dynamic DNS provider isn't good or being the problem? It's obvious that the emails are not even reaching the server or are they?

Any help would be deeply appreciated guys.


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May 11, 2009 at 06:03:00
What are you using for what you call your "NAT server"? When you send an email to the "user" are you using the FQDN?

How do you know when a politician is lying? His mouth is moving.

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May 11, 2009 at 06:11:47
Did you create Exchange accounts for the users?


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May 11, 2009 at 06:24:08
Yeah. I've created all of the accounts in active directory. Emails sent internally are absolutely fine.

For the NAT, it's a server 2003 and all i did was created to LAN connections. One that points outbound to the internet and one that is inbound.

The root name of the domain is let's say 'SERVER2003'. So the nat is called NAT1.Server2003dotCom, exchange is Exchange.Server2003dotCom etc. However, I obviously wanted emails to be received and sent by the domain I purchased. So, I changed the recipient policies in exchange to make sure that this was the case. If my domain name is called 'Butlerdotcom', then that's what I set the policy to. I can receive emails externally from it. It's just when I want to send an email back to that exact same user, that it fails.

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May 11, 2009 at 12:34:39

You probably need to check your MX records, internally and out. You don;t say what your domain is, but try somthing like this (important to try outside and inside your network)

on windows

nslookup -querytype=mx

or linux

dig mx

and see if you get the same result in and out. You might get a problem if your domain name externally is the same as your ad domain. The dns might be thinking it is authorative inside when it really isn't.


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May 11, 2009 at 14:30:13
What exchange version are you running?

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May 12, 2009 at 01:44:22
PJSmith:...I posted my query up on here last night, but somehow it's gone this morning. Did they take it off because of private information? Should i private message it to you?

I'm at work and the query that PJ asked me to do comes up with almost identical results as the query I did when I was at home (internal).

I'm running version Exchange Enterprise version SP2.

Much appreciate your follow up:)

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