Re: I've seen a definite uptick in these
"Little tip if you use Gmail... you can add indicators to your email address by using a '+'"
It's a good tip, which I try to use as often as possible. However, many websites have email address checkers built into the web submission form that reject the '+' character as invalid. I've tried emailing site owners with a link to the RFC that defines valid characters for email addresses, but haven't had much response. By not much response, I mean absolutely nothing, not a single reply.