Quote:
Originally Posted by charlesgan
any shared IP hosting is exposed to this problem. the way to escape from this is to get a dedicated IP address for your website.
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Clearly he already has a dedicated IP address since he stated that he's using a VPS...
Assuming that you're using commercial / mature forum software I doubt that they contain insecure email scripts etc.
Richie_Ni's link should help identify which blacklists have you listed. Some of those blacklist providers will give you access to sample emails (or headers) so that you can figure out where the email originated from (i.e. which script etc.).
Obviously make sure that your mail server isn't running as an open relay, and beyond that your hosting provider should be able to help you identify the source of spam by reviewing logs etc.