Exchange Server recipients are any objects within AD forest that has email address configured. When AD objects are configured with an email address, they appear in the Global Address List (GAL).Exchange Server 2013 supports the following recipient types:
- User mailboxes: A mailbox that you assign to an individual user in your Exchange Server organization.
- Mail contacts: Contacts that contain information about people or organizations that exist outside an Exchange Server organization and that have an external email address.
- Mail users: Users who have an AD user account but have an external email address. All messages sent to the mail user are routed to this external email address.
- Resource mailboxes (room and equipment mailboxes): A resource mailbox is configured for objects such as meeting rooms, or resources such as a projector.
- Site mailboxes: Mailboxes that include both an Exchange Server mailbox and SharePoint site. With site mailboxes, messages are stored in the mailbox, whereas documents arestored on the SharePoint site.
- Remote mailboxes: Mailboxes that are located in the Exchange Online environment. In a hybrid Exchange Server 2013 deployment, you can use Exchange Administration Center (EAC) to create and manage Remote Mailboxes.
- Shared mailboxes: A mailbox that is used by multiple users rather than one primary user. Shared mailbox use cases are such as sales, or help desk.
- Mail-enabled security groups: You can use a mail-enabled AD security group object to grant access permissions to AD resources, and you also can use it to distribute messages.
- Mail-enabled distribution groups: You can use a mail-enabled AD distribution group object to distribute messages to a group of recipients.
- Dynamic distribution groups: A distribution group that uses a LDAP query with recipient filters and conditions to derive its membership at the time messages are sent.
- Linked mailboxes: Regular mailboxes that are associated with individual users in a separate, trusted forest. When you create a linked mailbox, a disabled user account is created in the Exchange organization, and a user account from a trusted forest is given access to the mailbox.
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