Re:Ask HN: I want to divorce Google for mail. Recommendation...
by read_wharf on Tuesday April 03, 2012 @07:43AM
(#3792491)
Cool. I just tested that on my fastmail address and it works. [email protected]
Even cooler, I don't use my fastmail address, I use my own domain and point it at fastmail, and that still works. [email protected]
Edit: none of those are real addresses. :)
If you send an email to [email protected], you'll still get the email in your Inbox, but you can make rules that allow you to send stuff addressed to +something to specific folders. It's great.
I thought it was just a Gmail thing, but it's part of one of the email RFCs.