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FAQ: Why can I not send to Internet users that have the same domain as my Exchange Server?
When you assign a domain to Exchange Server it assumes all email addresses with that domain are local.
Here is an example:
The company Acme has the Internet domain acme.com. Acme has Internet mailboxes at their ISP receiving mail
for joe@acme.com and alice@acme.com. Alice is a user on Exchange Server but Joe is not. He pulls his messages
down using his own email client from a remote location.
Now, Alice needs to be able to send mail to Joe but since her Exchange Server is configured as acme.com she cannot send
mail out to joe@acme.com.
Solution
Assign a different domain to your Exchange Server (eg. acme.local.com). In Exchange 2000 and 2003 change the Default Recipient Policy
and in Exchange 5.x change the Internet Mail Service properties on the Routing tab.
In the Exchange System manager go to your Recipients->Recipient Policies->Default Policy.
Then open the properties and then open the E-Mail Addresses tab. Here you can add a second SMTP type entry and
enter a local domain eg acme.local.com
Set this local domain as the primary type SMTP and then edit the acme.com entry here you will see checkbox for
Exchange Server being responsible for email delivery for this address uncheck this box.
Assign all your users on Exchange Server a second SMTP address with the domain part being acme.local.com. Each user should
still have an SMTP default address with the domain part being acme.com, so when they send messages their return address is still
acme.com. In Exchange 2000 and 2003 you will see a checkbox to automatically update based on Recipient Policy unckeck this box.
Now, Alice can send to joe@acme.com because Exchange Server's local domain is acme.local.com not acme.com.
To receive messages you need to configure eXchange POP3 to send the messages it pulls down to acme.local.com or acme.com depending on which domain is registered in the license code.
If Alice was receiving her Internet mail at an account assigned just to her (single user account) then in eXchange POP3 set
this account to send its messages to either alice@acme.com or alice@acme.local.com, depending on which domain is registered in the license code. Exchange will accept messages to either address.
If Alice was receiving her Internet mail at an account assigned to more than one person (multiple user account) then this account
still needs to look for acme.com addresses. The eXchange POP3 can still continue to deliver these messages to the address at acme.com. If only the acme.local.com domain is registered in the license code
Setup a rule in the eXchange POP3 Rule section that for any messages downloaded from this account map the domain from
acme.com to acme.local.com
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