Jan-Piet Mens

While glancing at mail logs, I detected this lovely bit:

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  pippi.langstrumpf@villa-kunterbunt.de
    SMTP error from remote mail server after RCPT TO:
:
    host mail.villa-kunterbunt.de [213.239.202.189]:
    553 5.3.0
... No such user here

ROFL.