REMP, which stands for REMP Email Protocol, is a RESTful protocol for receiving and sending e-mails.
(Name by invented by @NuckChorris)
To learn more about REMP origins, see IRC log from #node.js.
SMTP, IMAP and POP3 are doing just fine, but are not accessible enough for web services. They don't support modern methods of authorization and authenthication (besides this project by Google).
When specification gets done, sure.