Understanding E-Mail Address Policies
Applies to: Exchange Server 2010
Topic Last Modified: 2009-12-09
Recipients (which include users, resources, contacts, and groups) are any mail-enabled object in Active Directory to which Microsoft Exchange can deliver or route messages. For a recipient to send or receive e-mail messages, the recipient must have an e-mail address. E-mail address policies generate the primary and secondary e-mail addresses for your recipients so they can receive and send e-mail.
By default, Exchange contains an e-mail address policy for every mail-enabled user. This default policy specifies the recipient's alias as the local part of the e-mail address and uses the default accepted domain. The local part of an e-mail address is the name that appears before the at sign (@). However, you can change how your recipients' e-mail addresses will display. For example, you can specify that your recipients' e-mail addresses display as email@example.com.
Furthermore, if you want to specify additional e-mail addresses for all recipients or just a subset, you can modify the default policy or create additional policies. For example, the following figure illustrates a configuration in which the recipient David Hamilton can receive e-mail messages addressed to firstname.lastname@example.org and email@example.com.
Looking for management tasks related to e-mail address policies? See Managing E-Mail Address Policies.
Exchange applies a policy to all recipients that match the recipient filtering criteria:
The recipient policy functionality is divided into two features: e-mail address policies and accepted domains.
Note: A detailed discussion about accepted domains is outside the scope of this topic. For information about accepted domains, see Understanding Accepted Domains.
When you run the Update-EmailAddressPolicy cmdlet in the Exchange Management Shell, the recipient object is updated with the e-mail address policy. For detailed syntax and parameter information, see Update-EmailAddressPolicy.
Each time a recipient object is modified and saved, Exchange enforces the correct application of the e-mail address criteria and settings. When an e-mail address policy is modified and saved, all associated recipients are updated with the change. In addition, if a recipient object is modified, that recipient's e-mail address policy membership is reevaluated and enforced.
When creating an e-mail address policy, you can use the following e-mail address types:
Precanned SMTP e-mail address. Precanned SMTP e-mail addresses are commonly used e-mail address types provided for you.
Custom SMTP e-mail address. If you don't want to use one of the precanned SMTP e-mail addresses, you can specify a custom SMTP e-mail address.
When creating a custom SMTP e-mail address, you can use the variables in the following table to specify alternate values for the local part of the e-mail address.
Custom SMTP e-mail address
Given name (first name)
Surname (last name)
Uses the first x letters of the surname. For example, if x = 2, the first two letters of the surname are used.
Uses the first x letters of the given name. For example, if x = 2, the first two letters of the given name are used.
Non-SMTP e-mail address. The following types of non-SMTP e-mail addresses are supported:
EX (Legacy DN Proxy Address Prefix DisplayName)
Exchange Unified Messaging proxy address (EUM proxy address)
Important: In Exchange, all non-SMTP e-mail addresses are considered custom addresses. Exchange doesn't provide unique dialog boxes or property pages for X.400, GroupWise, or Lotus Notes e-mail address types. If you add a non-SMTP custom e-mail address, you must have the appropriate dynamic-link library (DLL) files. If you don't provide the appropriate DLL files, you won't be able to create a customized e-mail address policy. The following error will be logged in Event Viewer: "The e-mail address description object in the Microsoft Exchange directory for the 'SADF' address type on 'i386' machines are missing."
- EX (Legacy DN Proxy Address Prefix DisplayName)
For detailed instructions about how to create an e-mail address policy, see the following topics: