How do i get my IP reputation for poor to a good status.

I have a email servre that is not on any blacklist but is listed on MTA's as a poor reputation. I have not found any issue with my mail server. How do I get my reputation to change. I am getting failures when sending to d=certain email domains and have not been able to figure this one out.

ANY THOUGHTS???
jimheideAsked:
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jimheideConnect With a Mentor Author Commented:
Found serious configuration issues from prior 'administrator'. Reconfigured and reputation is now stellar.
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woolnoirCommented:
Is it a dynamic IP from your ISP ? does the IP/HOSTNAME match in forward and reverse lookups ? which ISP are you with (as that could effect the rating). You could consider routing your mail through a 3rd party such as changeip.com (incoming) or your ISP (outgoing) to increase your 'perceived' rating.
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jimheideAuthor Commented:
Increased knowledge of mail server security through research and tech support.
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