Mobile Email with UUCP
Subject:   Ditch SMTP for Modified IMAP
Date:   2005-03-18 15:12:48
From:   divides_by_zero
Response to: Better SMTP!

Another novel solution to sending mail is to patch IMAP servers to send out mail when a message is copied into the OUTBOX folder.

I believe this functionality already exists for Courier IMAP.