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1. I cant see why hundrads of site would do that to you if they were not hosted by the same guys.
2. EVEN if hundrads of sites do that to you, probably most of them do not have traffic. So it shouldn't hurt you and therefore not a problem.
3. IF hundrads of site with a lot of traffic do that to you that means you pissed alot of different people cause its not probable that one person with hundrads of sites which all are big is attacking you like that.
4. If 3 is indeed the case, take action against this person. Alot of time, if its one person, the different sites are all hosted in the same place, or few different places.
IN ANY CASE, redirect the hit back to the referrer from all the sites that do that to you. You can do that with mod_rewrite and RewriteMap.
WARNING: Make sure that the sites (the hundrads you list there) are indeed hitting you, so you don't hit back on innocent sites.
Recommendtion: start from the bigger ones so your immediate problem is fixed fast.
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