A cyber-fiend who hijacks your e-mail transmissions for horrific ends and instantly declares your message a failure.
"...that I may have your hand in matrimony." SEND
MAILER-DAEMON: < message failure>
" O scowl of night!"
MAILER-DAEMON: < message failure>
" O scowl of night!"
by cisco djidd June 28, 2009
aaand, send. Not again! mailer-daemon sent it back once again!
mailer-daemon@googlemail.com: Message failed to send to <someone@example.com>
mailer-daemon@googlemail.com: Message failed to send to <someone@example.com>
by Griggles October 19, 2020