Setting MX records - help please

[RubinCompServ]

I currently own a public domain (call it domain.com) and I have Exchange Server 2000 running behind a router (using NAT) as part of a domain called domain.local. domain.com is hosted by adaptive.net and I'm using their DNS servers. I have configured an A-record of home.domain.com to point to IIS on my server, and it works. I have configured an MX record of mail2.domain.com to point to home.domain.com but when I send an email to admin@mail2.domain.com, I get a bounceback:

550 5.7.1 Unable to relay for admin@mail2.domain.com
550 <admin@mail2.domain.com>... User unknown

From other computers behind the router, I can send email to admin@domain.local and I can send Internet mail from behind the router, I just can't send mail TO users on my network.

Furthermore, adaptive.net had configured an MX record of mail to point to flanders.adaptive.net. (their mail server) and I can use it by going to http://mail.domain.com:8383. I configured an MX record of temp to point to flanders.adaptive.net., but http://temp.domain.com:8383 doesn't work.

I hope someone here can help, because I'm tearing out my hair over this one.

cheers,
DSR

 

[Soybomb]

I got lost in your explanation a bit, but from that bounce it looks like you need to check your MTA settings not your MX records. Be sure your mta knows to accept mail for that domain and how to verify valid users for that domain.

 

[skyking]

sounds like you have it, soybomb. That error is from your server, which does not know it is "mail2domain.com"

 

[RubinCompServ]

I could see the reply coming from my server, if the bounceback wasn't immediate. But does it really make sense that it should take less than 2 seconds (in multiple tests) for it to contact my server and receive an error messge?

If my original post was less than clear, please let me know what I need to clarify.

 

[Soybomb]

[qI could see the reply coming from my server, if the bounceback wasn't immediate. But does it really make sense that it should take less than 2 seconds (in multiple tests) for it to contact my server and receive an error messge?[/quote]
Why should it take longer for your mail server to determine if thats an invalid user/domain?

Perhaps an exchange person can make a suggestion on where to look for the configuration for that.