It's root mail. System messages to the root user, and for the life of me, I can't remember the BSD commands to recover (too stuck in HP-UX, the bastard stepchild of BSD). Try "msg" or man msg, mail, or similar terms.
Since it appears to be at your user, rather than root, just try "mail" (without the quotes).
that got rid of the message, but im not really sure what exactly was deleted,