Best advice I can offer on protecting against email harvesting is to not place email addresses directly on the pages. If you need to allow visitors to send email from the site, use web forms.
From what I understand, email harvesting is done by reading the content on a page rather than the underlying code. If you have a form that uses a perl or php script to send mail, then the email addy is embeded in the code of a non linked page/script and not visable on the site.
As for bandwidth theft/excess traffic, the most common instances are someone linking to a resource (image, script, video/audio clip, etc.) or just someone pointing traffic to your site. Most of this is done by people just linking to your resource in their code (i.e., <img src="http://yoursites.com/images/imagename.jpg">). I don't know of any real preemptive defense against this. Really all you can do is keep an eye on your bandwidth and make sure you have a decent stats system that can tell you where most of the traffic to your site is comming from. If you notice in your stats that 80% of your incomming traffic is comming from a specific site and is pointing to a specific file, then you should probably contact the owner/maintainer of the site and ask them to kindly stop leeching your bandwidth. If you're willing to provide them with the resource (and if it's yours to provide) then you can offer to give it to them so they can link it locally on their site.
Hope this helps 
Last edited by shardinite : 03-26-2006 at 05:55 AM.
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