Definition

User Principal Name (UPN)

In the Windows operating system's Active Directory, a User Principal Name (UPN) is the name of a system user in an e-mail address format. The user name (or "username") is followed by the "at sign" followed by the name of the Internet domain with which the user is associated. An example might look like: bill.yeti@walkingstick.kathmandu.np. The UPN format is based on Internet RFC 822.

Related glossary terms: teergrube, image spam, backscatter spam, spambot, edge transport server, Sender ID, spamblock, whitelist, Vouch by Reference (VBR), KnujOn

This was last updated in September 2005

Posted by: Margaret Rouse

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