Best ISPconfig users, From the beginning one user on the server is getting alot of emails daily from the 'Mail Delivery System' containing: I replaced ip's and domainnames with: xxxx ---- This is a MIME-encapsulated message. --4965031F40.1217205959/gaia.xxxxxx.nl Content-Description: Notification Content-Type: text/plain This is the Postfix program at host gaia.xxxxxx.nl. I'm sorry to have to inform you that your message 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 Postfix program <firstname.lastname@example.org>: host localhost.localdomain.xxxxxx.nl said: 451 Temporary local problem - please try later (in reply to RCPT TO command) --4965031F40.1217205959/gaia.xxxxxxx.nl Content-Description: Delivery report Content-Type: message/delivery-status Reporting-MTA: dns; gaia.xxxxxx.nl X-Postfix-Queue-ID: 4965031F40 X-Postfix-Sender: rfc822; email@example.com Arrival-Date: Wed, 23 Jul 2008 02:35:05 +0200 (CEST) Final-Recipient: rfc822; firstname.lastname@example.org Action: failed Status: 4.0.0 Diagnostic-Code: X-Postfix; host localhost.localdomain.xxxxxx.nl said: 451 Temporary local problem - please try later (in reply to RCPT TO command) --4965031F40.1217205959/gaia.xxxxx.nl Content-Description: Undelivered Message Content-Type: message/rfc822 Received: from gaia.xxxxxx.nl (gaia [127.0.0.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by gaia.xxxxxx.nl (Postfix) with ESMTP id 4965031F40 for <email@example.com>; Wed, 23 Jul 2008 02:35:05 +0200 (CEST) Received: (from domain.nl_danny@localhost) by gaia.xxxxx.nl (8.13.1/8.13.1/Submit) id m6N0Z4h3003235 for firstname.lastname@example.org; Wed, 23 Jul 2008 02:35:05 +0200 Date: Wed, 23 Jul 2008 02:35:04 +0200 From: danny <email@example.com> Message-Id: <200807230035.m6N0Z4h3003235@gaia.xxxxxx.nl> X-Loop: firstname.lastname@example.org Subject: Mailsize: henkiehuisgevaar.nl_danny To: undisclosed-recipients:; 979 --------- Anyone a solution?