Configure the accepted domain entry by following these steps:

1. Open the Exchange Management Console. Expand the Organization Configuration node, and then click Hub Transport. Click the Accepted Domains tab in the results pane.
   
   
2. In the action pane, click New Accepted Domain… The New Accepted Domain wizard appears.
   
   
3. On the New Accepted Domain page, type a name to identify the accepted domain entry. In the Accepted Domain field, type the SMTP domain name. Select Authoritative Domain. E-mail is delivered to a recipient in this Exchange organization. Click New. On the Completion page, click Finish.
   
   

Configure an e-mail address policy for the authoritative domain by performing the steps in this section that meet the objectives of your scenario.

To change the primary (reply to) e-mail address assigned to recipients, and keep the existing e-mail address as a secondary e-mail address, follow these steps:

1. Open the Exchange Management Console. Expand the Organization Configuration node, click Hub Transport. Click the E-mail Address Policies tab in the results pane. Select the e-mail address policy that you want to modify, click Edit in the action pane.
   
   
2. On the Introduction page, click Next.
   
   
3. On the Conditions page, click Next.
   
   
4. On the E-mail Addresses page, click Add. In the SMTP E-mail Address dialog box, select the option under E-mail address local part that determines how the recipient's e-mail address alias will be generated. In the E-mail address domain field, use the drop-down menu to select an accepted domain entry from the list. Click OK.
   
   
5. On the E-mail Addresses page, select the new address entry and then click Set as Reply. The e-mail address entry is displayed in bold type to indicate that it is now the primary, or reply to, address for the recipients to which this e-mail address policy applies. Click Next.
   
   
6. On the Schedule page, select an option to specify when the e-mail address policy will be applied and the maximum length of time that the task is permitted to run. Click Next.
   
   
7. On the Edit E-mail Address Policy page, click Edit to save the changes to the policy and apply it to affected recipients.
   
   
8. On the Completion page, click Finish.
   
   

To create additional e-mail addresses that will be used as the primary e-mail address for a filtered set of recipients, follow these steps:

1. In the action pane, click New E-mail Address Policy… The New E-mail Address Policy wizard appears.
   
   
2. On the Introduction page, type a name for the E-mail Address Policy. Select an option under Include these recipient types to determine to which recipient types this e-mail address policy will be applied. Click Next.
   
   
3. On the Conditions page, in the Step 1 box, select the condition that will be used to filter the recipients to which the policy is applied. For example, you can select Recipient is in a Company to apply the policy to only recipients whose properties identify a specific company affiliation. In the Step 2 box, click the underlined value to specify the value that the filter must match. For example, if you selected Recipient is in a Company, click the word "specified". The Specify Company dialog box opens. Type a company name and then click Add to add the company name to the list of names that the recipient's Company attribute must match in order to have this policy applied to them. If you add multiple entries, the recipient attribute must match only one entry to meet the filter conditions. Click OK to close the dialog box, and then click Next.
   
   
4. On the E-mail Addresses page, click Add. In the SMTP E-mail Address dialog box, select the option under E-mail address local part that determines how the recipient's e-mail address alias will be generated. In the E-mail address domain field, use the drop-down menu to select an accepted domain entry from the list. Click OK. The e-mail address entry is displayed in bold type to indicate that it is now the primary, or reply to, address for the recipients to which this e-mail address policy applies. Click Next.
   
   
5. On the Schedule page, select an option to specify when the e-mail address policy will be applied and the maximum length of time that the task is permitted to run. Click Next.
   
   
6. On the New E-mail Address Policy page, click New to save the policy and apply it to affected recipients.
   
   
7. On the Completion page, click Finish.
   
   

Note:
If a recipient meets the filter conditions of more than one e-mail address policy, the e-mail address policy that has the lowest number is set as the primary address. The e-mail address policy that has the lowest number is highest in the priority list. Any other e-mail address policies that also apply are set as secondary addresses.

Use the New-AcceptedDomain cmdlet to create an authoritative accepted domain entry for each SMTP domain for which your Exchange organization will host recipient mailboxes. For example, run the following command to create an authoritative domain called FourthCoffee.com.

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New-AcceptedDomain -Name "Fourth Coffee subsidiary" -DomainName FourthCoffee.com -DomainType Authoritative

To change the primary e-mail address assigned to recipients and keep the existing e-mail address as a secondary address, use the Set-EmailAddressPolicy cmdlet to modify an existing e-mail address policy. For example, if your default e-mail address policy sets recipient e-mail addresses to useralias@contoso.com, run the following command to change the reply to address to useralias@fourthcoffee.com and continue to use useralias@contoso.com as a secondary address.

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Set-EmailAddressPolicy -Identity "Default Policy" -EnabledEmailAddressTemplates SMTP:@fourthcoffee.com,smtp:@contoso.com

Note:
If you type SMTP in all uppercase letters, this indicates the primary (reply to) address. If you type smtp in lowercase letters, this indicates the secondary address.

To apply the new e-mail address policy to recipients, run the following command.

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Update-EmailAddressPolicy -Identity "Default Policy"

To create additional e-mail addresses that will be used as the primary e-mail address for a filtered set of recipients, use the New-EmailAddressPolicy cmdlet to create an e-mail address policy for each accepted domain that will be used as part of a recipient's e-mail address. For example, run the following command to create a new e-mail address policy for FourthCoffee.com, assign that policy to the recipients in the Fourth Coffee department, and set the highest priority for that e-mail address policy.

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New-EmailAddressPolicy -Name "Fourth Coffee Recipients" -IncludedRecipients UserMailbox -ConditionalDepartment "Fourth Coffee" -Priority 1 -EnabledEmailAddressTemplates "SMTP:@fourthcoffee.com"

To apply the new e-mail address policy to recipients, run the following command.

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Update-EmailAddressPolicy -Identity "Fourth Coffee Recipients"