Senders must have valid reverse DNS

can you help me resolve the bouncing back of mail to certain addresses, im running MailDaemon on windows serve 2003
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More about senders valid reverse
  1. Creating a reverse DNS record may only partially resolve your problem.
    Without looking at it, the problem could be a number of things.

    The obvious answer is to add the appropriate PTR record, however -

    Do you have a static IP address that your ISP has assigned you (have they assigned static reverse records for your address space if yes?)?
    Do you have the correct certs installed?
    Do you have your hostname configured properly?

    Edit: Corrected Spelling xD
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