Used to ease the administrator ??™ s burden of manually adding Recipients to
Distribution Groups, a Dynamic Distribution Group ??™ s membership is based upon a preset Recipient
filter and calculated each time a message is sent to this group. Group membership can include all
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Recipient types including other mail - enabled groups. In Exchange Server 2003, Query Based Distribution
Groups accepted emails from all senders. This is, however, different in Exchange Server 2007 because
Dynamic Distribution Groups by default accept only emails from authenticated senders. This
configuration can be changed by modifying the message delivery restrictions on the Dynamic
Distribution Group. You can use the Get-Recipient and Get-DynamicDistributionGroup cmdlets
to display Dynamic Distribution Groups available in the Exchange organization. (See Figure 4 - 20 .)
Figure 4-20
You would also notice that when an Exchange Server 2007 Dynamic Distribution Group is created, it
stores its RecipientFilter in an OPATH format, whereas in Exchange Server 2000/2003, the Query
Based Distribution Groups filter is stored in an LDAP format. The following blog by Bill Long provides
an available PowerShell script to convert LDAP filters to OPATH format: http://msexchangeteam.
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