[courier-users] is my server a relay?

I did some testing and this email from abuse.net apparently thinks I am although for the life of me I can't figure out how. I am also getting several "bounced" emails/day from Postmasters which I know I didn't send email too. I went to the URL at bottom but nothing on Courier there. I know Courier is supposed to stop relaying by default but then how did this email get to me and why am I getting bounced emails for emails I never sent?

Here's the email from abuse.net which tested relaying:

Delivered-To: slane@ping-us.com
Return-Path: <spamtest@abuse.net>
Received: from www.abuse.net (www.abuse.net [::ffff:208.31.42.77])
by www.ping-us.com with esmtp; Tue, 27 Dec 2005 07:19:20 -0800
To: slane@ping-us.com
From: securitytest@abuse.net
Subject: Test for susceptibility of ping-us.com to third-party mail relay
Date: Tue, 27 Dec 2005 15:10:08 GMT
Message-Id: <rlytest-1135696208-20670@abuse.net>
Sender: slane@ping-us.com
X-Sender-IP: 162.84.183.84
X-Envelope: <spamtest@abuse.net> -> <slane@ping-us.com>

This is a test of third-party mail relay, generated via the
Network Abuse Clearinghouse at http://www.abuse.net.

Target host = www.ping-us.com [207.234.130.23]
Test performed by <slane@ping-us.com> from 162.84.183.84

A well-configured mail server should NOT relay third-party email.
Otherwise, the server is subject to abuse by vandals and spammers,
and probable blacklisting by recipients of the unwanted third-party
e-mail.

For information on how to secure a mail server against third-party
relay, visit <URL: http://www.mail-abuse.com/support/an_sec3rdparty.html>.




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