I like the simplicity. However, i think there might be a few bugs left.
I got my temporary email address, but when I click on the email from "team@receiveee.com" in the inbox, I get "Sorry we where looking hard, but could not find that mail :("
Also, I've just sent two test emails to the temporary address, and neither has arrived in the inbox.
edit: I'm now getting "502 Bad Gateway" errors.