Problem Setting Up Multiple Domain Names on One Server

[jackgtt]

Ok, we have a single Exchange 5.5 server.

All our email has always been sent to user@company.com

I need to add another domain for our users to receive email from, for example, user@office.com

So I worked with AT&T, and I added an A record and MX record for the new domain.

I also went into the Routing tab under Internet Mail Services and added the second domain name....

office.com <inbound>



I added another SMTP address for my mailbox...so now I have admin@company.com and admin@office.com both listed.

If I send an email internally, to admin@office.com it works fine. But if I try to send from an external source I get a reply saying..

Technical details of failure:
PERM_FAILURE: SMTP Error (state 10): 550 5.7.1 <admin@office.com>... Relaying denied



I am not sure why the server is not accepting the incoming mail. Any ideas?

Thanks in advance.

 

[Vos]

Did you restart the IMS after you made the routing changes?

We've got the exact same setup as you do, and we're able to receive the other domains fine!

Hope this helps.

There are 10 types of people in the world,
those who know binary, and those who don't!

Vos

 

[jackgtt]

Yes, I did restart the IMS after any changes. I am wondering if the public DNS changes I made are still in a transition phase, it has been 48 hours now.

 

[Vos]

Easy enough to find that out...

Do an NSLookup, change to show MX records ('set type=mx'), then just type the new Email domain name. If it shows the public IP of your Exchange server and the preferences, you're in business!

Hope this helps!

There are 10 types of people in the world,
those who know binary, and those who don't!

Vos

 

[GellyBelly]

Hi,

I need to work on a similar setup.
What about outbound email? Is this sufficient for sending out?

 

[Griffyn]

We have two domains on one server, got two MX records, etc. but instead of having both set as <inbound> in Exchange, I reroute domain2.com to domain1.com. That way I don't have to duplicate e-mail addresses in everyone's mailbox. It means that if you had user@domain1.com before, with this simple change, you can also receive e-mail at user@domain2.com. When you send mail out however, it will have a reply address of user@domain1.com

I also find this setup handy to do a quick diagnostic on whether there are any mail problems. For example, sending an e-mail to user@domain1.com will automatically resolve to an internal address and won't be handled by the IMC. But if I send an e-mail to user@domain2.com, the IMC gets involved, communicates with itself via the internet and receives it back in. It's a guarantee that everything is working properly.