Another Case Against Blacklists

This was just too good to pass up.  Our customer support person just received this bounce and sent it to me for diagnostics:

From: MAILER-DAEMON@mail01h.rapidsite.net

Date: 4 Mar 2005 03:57:51 -0000

To: yyy@zzz.com
Subject: failure notice

Hi. This is the qmail-send program at mail01h.rapidsite.net.

I'm afraid I wasn't able to deliver your message to the following addresses.

This is a permanent error; I've given up. Sorry it didn't work out.

xxx@yyy.net:

66.150.45.42 does not like recipient.

Remote host said: 550 5.2.1 Mailbox unavailable. Your IP address 131.103.218.175 is blacklisted using SPAMCOP. Details: Blocked - see http://www.spamcop.net/bl.shtml?131.103.218.175.

Giving up on 66.150.45.42.

So, if you'll follow me here: 131.103.218.175 is blacklisted.  That IP address is mail01h.rapidsite.net.  But that's the mail server that's receiving the email (and relaying it to someone else - presumably one of the ISP's customers).  So it's refusing to deliver mail because it is blacklisted, itself!