Paul Allen wrote:
> It seems some customers and partners of ours are rejecting mail from us
> as being Spam.
> 
> Anyway, the only two possible explanations I can think of are:
> 
> 1. Our mail server external IP address has changed causing some spam
> filters to tag them because of the change in the header.
> 
> 2. We've been blacklisted somewhere due to some other source of spam.

According to http://www.mxtoolbox.com/blacklists.aspx you have not been
blacklisted anywhere.

Without a copy of the spam rejection, conjecture becomes more difficult
at this point.

-john


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