The first thing for Exchange Server 2010 to configure is the accepted domains. In order to

receive SMTP messages from the Internet, an Exchange server has to know what domains

it will be receiving email for, as well as which domains it is responsible for. These are called

‘accepted domains’, and there are three types:

• Authoritative Domain – For this type of domain, the Exchange organization is fully

responsible and there will be no other messaging environment responsible. This

Exchange organization will also generate NDR (Non Delivery Report) messages when

mailboxes are not available.

• Internal Relay Domain – The Exchange organization will receive mail for this type of

domain, but it will relay all messages to an Exchange organization within the company.

• External Relay Domain – And for this type of domain, the Exchange organization will

receive mail, but it will relay all messages to a messaging platform outside the company.

For all three scenarios the MX records for the domain will be pointing to your Exchange

organization, and mail will be initially delivered to your Exchange servers.

Accepted domains are configured on the organization level and, as such, are known by all

Hub Transport Servers. If you are using an Edge Transport Server as well, the accepted

domain information will also be synchronized to the Edge Transport Servers.

To configure accepted domains follow these steps:

1. Logon to an Exchange Server 2010 server with domain administrator credentials and

open the Exchange Management Console;

2. Expand the “Microsoft Exchange On-Premises”;

3. Expand the Organization Configuration;

4. Click on Hub Transport in the left pane;

5. In the middle pane there are eight tabs, click on the Accepted Domains one;

6. One entry will appear, and the name will be the local domain (FQDN) that’s used when

installing the Active Directory. In the Actions pane click on New Accepted Domain;

7. In the New Accepted Domain Wizard enter a (friendly) name and the Accepted Domain

itself, for example yourdomain.com. When entered, select the type of Accepted Domain

in your Exchange Organization. In this example select the “Authoritative Domain”. Click

New to continue;

8. The Accepted Domain will now be created, and you can now click Finish on the Completion

window.

You have just created an accepted domain in your Exchange organization; the Exchange

server will accept messages for this domain, and if no recipients are found a NDR (Non

Delivery Report) will be generated.

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