So kann man auch erfolgreich verhindern, daß sich User aus einem Newsletter austragen (wenn man das Ganze schon nicht
per Webinterface macht):
This message was created automatically by mail delivery software.
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:
save to /var/opt/vmail/xxx-europe.net/no-reply/Maildir
generated by no-reply@xxx
(ultimately generated from no-reply@xxx)
mailbox is full