A few day ago, something weird happened to me, my mail server which uses SMTP authentication was listed in CBL, and as a result of that also in spamhaus.
I spent time reviewing, reading sending mail, trying to find out what was wrong with my server since CBL just told me "In short, this IP is impersonating being a machine we know it cannot be. No properly configured mail server does this under any circumstances." It was hard for me to find the problem.
I checked my maillog form start to end and everything seemed right, then I checked which ports I had opened, and same thing all was ok. Then I started doing some google search about CBL listing I just got references saying it did not give a clear response why you get blocked. To some extent it was like being eyes folded.
After reading manual, instructions and many other stuffs I realized that my server name was incorrectly set up at first, I fixed the problem but it kept getting listed. So I kept looking, until I found that one of many sited made reference to DNSSTUFF dns report, which actually pointed some mistakes for my domain. I fixed them and it almost my third day and I haven't got blocked. If you are running virtual domains I will suggest you to run dns report for each one of your domains. Make sure that you IP has a reverse DNS set correctly.
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