Re:Gmail trick: multiplying your address
by PinguTS on Tuesday November 18, 2014 @11:14AM
(#8624524)
To be honest, I've abandoned that use for some years now and use simply a catch-all on my domains. Much easier to use, especially as many larger organizations rejecting the + because of "fake" email address.
The length of time that it has existed is irrelevant--it's simply not commonly used yet. It's advanced usage, not basic.