An evil supernatural force that lives within cyberspace and randomly rejects sent emails for no apparent reason.
Dave: Did you email that hottie from Craigslist about hooking up this weekend?
Ryan: I tried but the mailer-demon apparently is already dating her...because he sent it right back to me.
Ryan: I tried but the mailer-demon apparently is already dating her...because he sent it right back to me.
by Not John Vallone November 6, 2010
Get the mailer-demon mug.