Mailer Daemon is Our Friend

So we were getting a lot of MAILER DAEMON errors to our server, like the following:

Hi. This is the qmail-send program at *censored*.
I'm afraid I wasn't able to deliver your message to the following addresses: *censored*@hotmail.com.edu
This is a permanent error; I've given up. Sorry it didn't work out.

Sorry, I couldn't find any host named hotmail.com.edu. (#5.1.2)

Full well knowing that Microsoft hadn't founded a University named after its famous web mail program, we immediately knew that hotmail.com.edu was not a real email address (We're just that good.)

We quickly suspected that must be a good reason for these fishy registrations. Without going into the details of the exploit, let's just say we've taken care of it.

"Better to die ten thousand deaths than wound my honor."
- Joseph Addison

Remember folks - in war, there are no "fake" soldiers. Play fair and fight with dignity. Read the Code of the Samurai if you have to.