That's not at all what I meant. Gmail redirects emails to "youremail+whateveryouwanthere@gmail.com" to "youremail@gmail.com". Some people filter emails this way, henceforth my suggestion to check for this edge case.

http://gmailblog.blogspot.de/2008/03/2-hidden-ways-to-get-mo...

PS: The downvoters are downright silly on this website lately.

Or someone from Scunthorpe (cf the "Scunthorpe Problem").

Or Dick van Dyke.