[lebowski99]

I have a small vbulletin forum for sports chat associated with a university. In the last week or two, many of my active posters have reported that my site is being blocked by their work filter. Reason listed is typically phishing, but also adult content (we have neither). At first I worried that someone had posted a link to a malicious site, but I can't find anything. My new theory is that we have a disgruntled former poster that is maliciously reporting my site to various filtering services. We had a DDoS attack a couple of years ago, so there is someone out there with an axe to grind.

Either way, I am desperate to get this resolved. Most of our activity is during a work day so if we get universally blocked it could kill us. Anyone experience something like this before? Is there any way to get a list of widely used filtering services and see what they blacklist and why?

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To clarify, the "disgruntled former poster" is just a theory. It could be anything.