Autoresponder funktioniert nicht

[Snooops]

Servus,
sobald ich den Autoresponder aktiviere erhalten alle Absender folgende E-Mail:

Code:

This is the mail system at host mail.host.tld.
I'm sorryE4�#@@B�

�ge could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<123@ispcp-arpl.clientDomain.de> (expanded from <123@clientDomain.de>): Command died with
   status 255: "/var/www/ispcp/engine/messenger/ispcp-arpl-msgr". Command
   output: Initialization vector must be exactly 8 bytes long when using the
   Blowfish cipher at /var/www/ispcp/engine/messenger/ispcp-arpl-msgr line 415

Final-Recipient: rfc822; 123@ispcp-arpl.clientDomain.de
Original-Recipient: rfc822;123@clientDomain.de
Action: failed
Status: 5.3.0
Diagnostic-Code: x-unix; Initialization vector must be exactly 8 bytes long
   when using the Blowfish cipher at
   /var/www/ispcp/engine/messenger/ispcp-arpl-msgr line 415


---------- Weitergeleitete Nachricht ----------
From: Dennis Meyer <user@absender.com>
To: 123@clientDomain.de
Date: Tue, 13 Apr 2010 08:57:42 +0200
Subject: test
test

Der Empfänger erhält zwar die E-Mail aber so etwas sollte natürlich nicht an den Absender gehen.