troubleshooting Question

port fowarding - Exchange 2007 - trying to avoid being blacklisted

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jkimzlg asked on
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I'm a time warner cable residential customer.  I have exchange server 2007 on Hyper-V.  I'm about to open port 25 and start emailing away for test enviroment.  What is the best way to avoid being blacklisted?  I've been blacklisted twice, and I have to end up waiting 2 weeks to get off the blacklist.  Any suggestions/settings I should make on my exchange server?
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