I have a Exchange 5.5 server that has been blacklisted by dsbl.org. I need to two things in to get it unlisted the first is to fix the reason why it was listed. They say that it is Opn HTTP Post Proxy and I have not been able to find anyting on how to block that. The next is that I have to get my server to accept mail from email@example.com which is not my domain so I'm not exactly sure onhow to do that. Can anyone point me in the right direction. Thanks.
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