2. <networking, standard> A backward electronic mail address. The world now follows the Internet hostname standard (see FQDN) and writes e-mail addresses starting with the name of the computer and ending up with the country code (e.g. email@example.com). In the United Kingdom the Joint Networking Team decided to do it the other way round (e.g. firstname.lastname@example.org) before the Internet domain standard was established. Most gateway sites required ad-hockery in their mailers to handle this.
By July 1994 this parochial idiosyncracy was on the way out and mailers started to reject big-endian addresses. By about 1996, people would look at you strangely if you suggested such a bizarre thing might ever have existed.