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It will be counted as the total number of its recipients, this means if it contains 500 recipients, it will be counted as 500 recipients, if restriction is applied , it will prevent sending.
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It will be counted as the total number of its recipients, this means if it contains 500 recipients, it will be counted as 500 recipients, if restriction is applied , it will prevent sending.

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I want to know if I restrict a user not to send an email more than 20 recipients what will happen if user sends an email to a group that has more than 20 members in it. &nbsp;A group will be considered as one recipient or as it has members? 
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I want to know if I restrict a user not to send an email more than 20 recipients what will happen if user sends an email to a group that has more than 20 members in it.  A group will be considered as one recipient or as it has members? 

How does exchange 2003 count email recipients?

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.