How to Manage the Default Recipient Policy
1. Click Start, point to Programs, point to Microsoft Exchange, and then click System Manager.
2. Expand the Recipients object, and then double-click Recipient Policies.
3. Right-click Default Policy in the right pane, and then click Properties.
Note that the Filter rules entry defines a single entry of (mailnickname=*) and that in the Filter rules section, the Modify button, and the Remove buttons are shaded. This behavior occurs because the default recipient policy must apply to all recipient objects (that is, all of those objects that have a mail nickname or alias).
4. Click the E-mail Addresses (Policy) tab.
A list of generation rules for e-mail addresses is displayed. Rules exist for SMTP and X.400 addresses. You can edit these rules, but you cannot remove them. For example, if your organization decides to change its e-mail address from ".com" to ".co.us," click the SMTP rule, and then click Edit.
5. In the Address field, type the new SMTP address, and then click OK.
6. Click OK.
You receive a message that states that you have changed e-mail addresses of SMTP type and you are prompted to update all corresponding e-mail addresses to match the new address format.
7. Either click Yes to update all existing addresses or click No if you do not want to change any existing objects. If you click No, the new SMTP address applies to all newly created recipients.
here is the orginal article
http://support.microsoft.c
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by: ColinRoydsPosted on 2004-11-29 at 01:37:10ID: 12694415
Open ESM , go to recipients / recipients policy / edit the default recipient policy and add in the new domain that you want, set it as default .
This will add the domain in to Exchange