Although the mail contact has an SMTP
address associated with the local Exchange organization, when a message is addressed to the mail
contact, the ExternalEmailAddress or PrimarySMTPAddress properties are used to route and deliver
the mail. These properties represent the information about the people existing outside the Exchange
organization.
In Figure 4 - 15 , the mail contact will have the EmailAddresses property populated with both SMTP
proxy addresses of the Exchange organization and external SMTP address of [smtp:ADMContact@
ExchangeExchange.local; ADMContact@bogusdomain.net] ; however, its PrimarySMTPAddress ,
which is used for mail routing, is ADMContact@bogusdomain.net .
You can use either the Get-Recipient or Get-MailContact cmdlets to return a list of mail contacts in
the Active Directory forest.
Figure 4-15
The mail forest contact is typically created by Microsoft Identity Integration Server (MIIS)
synchronization and represents Recipients existing in an external forest or organization.
The mail user is identical to the mail contact in the sense that it is used to contain information about
people outside the Exchange organization and could be part of a Distribution Group or address list. The
mail user, however, has logon credentials in the Active Directory forest and can access resources like any
other Active Directory user in the forest.
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