About 5 times a second, a new message is generated: This is the Postfix program at host server1.gonzo.banthewasp.com. 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 <email@example.com> (expanded from <admispconfig@localhost>): Host or domain name not found. Name service error for name=localhost.gonzo.banthewasp.com type=AAAA: Host not found Reporting-MTA: dns; server1.gonzo.banthewasp.com X-Postfix-Queue-ID: ACDC020B6D X-Postfix-Sender: rfc822; firstname.lastname@example.org Arrival-Date: Mon, 20 Mar 2006 18:29:41 +0000 (GMT) Final-Recipient: rfc822; email@example.com Original-Recipient: rfc822; admispconfig@localhost Action: failed Status: 5.0.0 Diagnostic-Code: X-Postfix; Host or domain name not found. Name service error for name=localhost.gonzo.banthewasp.com type=AAAA: Host not found Subject: Mailsize: web5_c2 From: firstname.lastname@example.org (c2) Date: Mon, 20 Mar 2006 18:29:41 +0000 (GMT) To: undisclosed-recipients:; 2566 I've already seen the posting at http://www.howtoforge.com/forums/archive/index.php/t-512.html and I've made sure that localhost.gonzo.banthewasp.com is listed in /etc/postfix/local-host-names (I didn't have to add it - it was already there). The original poster seems to have solved the problem thus: I will delete this email and try to create another. Trouble is, I'm not sure what he means by "delete". Does this mean deleting it from a queue somewhere? I don't know how to do that. I guess there are two problems: 1. The message to admispconfig is being generated in the first place - I don't know why or how to cure it. 2. The message to admispconfig can't be delivered. I don't know why that is either. At the moment the only way I can stop these emails being generated is "postfix stop" - which is not ideal in the long term.