Re:Gmail trick: multiplying your address
by diggan on Tuesday November 18, 2014 @10:26AM
(#8624194)
Also called sub-addressing in RFC 5233[0] or Address Tags. Gmail is not the only one of the email providers that enables this. Yahoo, Apple, Outlook, Fastmail and others also support this. More information at Wikipedia: http://en.wikipedia.org/wiki/Email_address#Address_tags
[0] https://tools.ietf.org/html/rfc5233