We have been acting on spam complaints. we have a system that auto switches the IP address if it gets blacklisted, so a bounce was either during the 5 minutes it takes to switch or because that local mail server had some sort of cache,
We have sent outblaze numerous emails look at the date stamp here:
2005-10-08 02:46:33
They aren’t doing anything with it they never sent a complaint(that I can find in outlook archives), and they are not sending us replies to messages we have sent.