custom recipient
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Microsoft Exchange 2003
In Exchange 5.5 and earlier, a custom recipient is a user who is not hosted by Exchange. In Exchange Server 2003, such users can be added to Active Directory as contacts, Windows users, or users whose Windows accounts are disabled. In any case, they are mail-enabled, but not mailbox-enabled, because their mailboxes are hosted on another messaging system. [Exchange 2003]
Technology› E-mail› Microsoft Email› Microsoft Exchange
Microsoft Exchange 5.5
A recipient in a foreign system whose address is in the Address Book. [Exchange 5.5]