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 for e-mail address
From The Free On-line Dictionary of Computing (30 December 2018) :

  electronic mail address
  e-mail address
      (Usually "e-mail address") The string used to
     specify the source or destination of an electronic mail
     message.  E.g. "john@doc.acme.ac.uk".
     The RFC 822 standard is probably the most widely used on the
     Internet.  X.400 was once used in Europe and Canada.
     UUCP-style+({bang+path">UUCP-style ({bang path) addresses or other kinds of source
     route became virtually extinct in the 1990s.
     In the example above, "john" is the local part which is the
     name of a mailbox on the destination computer.  If the
     sender and recipient use the same computer, or the same LAN,
     for electronic mail then the local part is usually all that is
     If they use different computers, e.g. they work at different
     companies or use different Internet service providers, then
     the "host part", e.g. "sales.acme.com" must be appended after
     an "@".  This usually takes the form of a fully qualified
     domain name or, within a large organisation, it may be just
     the hostname part, e.g. "sales".  The destination computer
     named by the host part is usually a server of some kind
     rather than an individual's workstation or PC.  The user's
     mail is stored on the server and read later via client mail
     software running on the user's computer.
     Large organisations, such as universities will often set up a
     global alias directory which maps a simple user name such as
     "jsmith" to an address which contains more information such as
     "jsmith@london.bigcomp.co.uk".  This hides the detailed
     knowledge of where the message will be delivered from the
     sender, making it much easier to redirect mail if a user
     leaves or moves to a different department for example.

Contact=webmaster@dict.org Specification=RFC 2229