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can't find mail exchanger or IP address

By quintar51 ·
I have a win2k AD domain setup. I've installed exchange 2k, sp3. I am able to send mail. However, if someone replies, they get an error message 'can't find mail exchanger or IP address'. I also have a yahoo account, and I also get the same error message if I try sending email to my account.

I've checked my DNS over, I do have an MX record there with the correct host name.

I'm also running behind a router, and I've checked that and it does allow both pop3 and smtp traffic in/out.
I've also have IIS running, and that is working fine, I'm able to access the website both inside and outside the network, so my domain is out there.

Any suggestions?

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can't find mail exchanger or IP address

by BudTheGrey In reply to can't find mail exchanger ...

Visit http://www.dnsstuff.com. You can use the tools there to see what response the internet at large gets when they query DNS to find the MX record for your domain.

I was going to ask if your router is allowing DNS queries in and out, but if folks can find your web site, it probably is.

Is there some other device than the router that could be filtering traffic? A firewall, proxy server, or some such?

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can't find mail exchanger or IP address

by quintar51 In reply to can't find mail exchanger ...

Thanks for the reply. I have no other devices that would filter any traffic. I only use my router and the built-in firewall that it comes with. This is a weird issue.

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can't find mail exchanger or IP address

by quintar51 In reply to can't find mail exchanger ...

Point value changed by question poster.

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can't find mail exchanger or IP address

by quintar51 In reply to can't find mail exchanger ...

Point value changed by question poster.

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can't find mail exchanger or IP address

by quintar51 In reply to can't find mail exchanger ...

Point value changed by question poster.

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can't find mail exchanger or IP address

by TechKid In reply to can't find mail exchanger ...

More than likely your private DNS server is not the authority for your public domain. The organization that you registered your domain name with is the authority.

You need to have the MX record listed with the authority DNS server (the organization that registered your domain name) or your ISP might host it for you.

You can use the NSLOOKUP tool to troubleshoot further.

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can't find mail exchanger or IP address

by quintar51 In reply to can't find mail exchanger ...

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can't find mail exchanger or IP address

by shmaltz In reply to can't find mail exchanger ...

I assume the problem is sending email from yahoo to your email, and not from your Exchange Server to yahoo.
This always relates to a DNS problem. Make sure that you can resolve your MX record (to your domain) from outside your network. To do that:On windows 2000/XP machine open a command prompt (Start>Run>cmd and OK) type (each line is exactly as typed followed by the enter key:
nslookup
set type=MX
yourdomainname

Where yourdomainname is the your domain name, for example, if your domain name is domain.com type
domain.com
If it doesn't gives you the correct IP Address (the one that points to your Exchange server) then the problem is with the DNS settings, and make sure to correct it.
Do the above from the Internet not from your LAN since the problem might be just on the Internet.

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can't find mail exchanger or IP address

by quintar51 In reply to can't find mail exchanger ...

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can't find mail exchanger or IP address

by jim.kam In reply to can't find mail exchanger ...

Techkid is correct! In this scenario you should have your MX record with the authority DNS server not on your Win2k DNS server. I had been solving this kind of problem for one of my customer. The problem is exactly as yours.

It’s relatively simple to check it out.

Make sure you have a connection to the Internet. From the command prompt in win2k or XP machine, issue this command ‘nslookup’, and then follow by
> set type=MX (Enter)
> xxx.com (Enter)

From the output information you should be able to see your public domain name, your fix IP, and your MX record. If not, call the authority that hosts your domain name to add it for you.

* make sure that the nslookup query is not coming from your own DNS server. The 'default server' when you run nslookup should be the DNS server of your ISP.

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