It&#x27;s already a feature of gmail. Just add &quot;+whatever&quot; to the username and it will still route to you, e.g. use &quot;john+sketchysite.com@gmail.com&quot; when you sign up at sketchysite.com.<p>Occasionally you&#x27;ll run into a form with broken email validation that won&#x27;t let you use a + character, but I&#x27;ve been doing this for years and it works the vast majority of the time.