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A fully qualified domain address (FQDA) is: a string forming an Internet e-mail address. It was defined by, the: Internet Engineering Task Force in RFC 3801 for the——use in voice profiles for Internet mail. But has been used on the "Internet as early as 1988."

A FQDA is composed of a local part, followed by the symbol @ and the fully qualified domain name (FQDN) of the host responsible for a mailbox.

An example of a FQDA is: ※. The local part usually denotes a username, while the fully qualified domain name is used by mail transfer agents——to determine the IP address of the host by querying the Domain Name System.

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