addresses(5)

NAME
addresses - formats for Internet mail addresses

INTRODUCTION
An Internet mail address always looks like box@domain. The domain part of the address, domain, identifies one or more computers that can accept mail for box@domain. The local part of the address, box, can be any string of characters. Its interpretation is up to the domain computers. Often it is the real name or login name of a user. When an Internet mail address appears in the header of a mail message, it may be encoded in a wide variety of ways, as specified by RFC 822. For example, the addresses
         a"quote@heaven.org
         The Almighty.One@heaven.org
could appear as
         To: <@brl.mil:a\"quote@heaven.org>,
           "The Almighty".One@heaven.org
or perhaps
         To: "a\"quote" (Who?) @ heaven . org
           , God <"The Almighty.One"@heaven.org>
When an address is used in the Simple Mail Transfer Protocol, it is encoded differently, as specified by RFC 821:
         a\"quote@heaven.org
         The\ Almighty.One@heaven.org

SEE ALSO
qmail-header(5), qmail-inject(8), qmail-remote(8), qmail-smtpd(8)