1. Mailbox-enabled users
2. Mail-enabled users
3. Contact recipients
4. Group recipients
5. Public folder recipients
Mailbox-enabled users
A mailbox-enabled user account is one that has a mailbox in the Exchange organization and, as a result, can send and receive e-mails through the Exchange Server infrastructure. A mailbox-enabled user has a domain user account in the Active Directory domain. A Mailbox enabled recipient can log on to network resources and can access domain resources. Users can be added to groups and appear in the global address list. Mailbox-enabled recipients can send and receive messages and store messages on their Exchange server mailboxes. You can use mailbox enabled recipients for all aspects and functions in Exchange Server 2003.
A mailbox-enabled user is tightly integrated with Active Directory, it can be configured through the Active Directory Users and Computers console. Most employees in an organization are mailbox-enabled.
Mail-enabled users
A Mail enabled recipient can receive messages only at an external e-mail address. The mail enabled recipient cannot send or store messages on Exchange message stores. A mail enabled user has an account in Active Directory but no Exchange mailbox. A mail enabled user is listed in the global address list. This enables other users to easily locate and send e-mail to a mail enabled user even if the account does not have a mailbox in the Exchange organization. For example, you may create a mail enabled user for onsite contract employees who require access to the network but who want to continue receiving their e-mail through their Internet service provider.
Contact recipients
These are like suppliers, customers with external email accounts. Contacts have no Active Directory account, just the email address of important people who your users regularly email. When you create a contact it appears in the Global Address List.
Group recipients
A group recipient object is the same as an Exchange Server distribution list. It is basically just a group that has been mail-enabled (not mailbox-enabled). When an email message is sent to the group’s email address, the message is forwarded to the group members’ individual mailboxes.
Public folder recipients
The last type of Exchange Server recipient is a public folder recipient — also known as a mail-enabled public folder. A public folder recipient is simply an Exchange Server public folder that has an email address associated with it.
There are many different uses for mail-enabled Exchange public folders, but the first example that comes to mind is a situation in which your company launches a new product and wants to receive feedback from customers. With a a mail-enabled Exchange public folder, you could receive all customer feedback in a central location, instead of flooding multiple personal mailboxes with those messages.
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