Known Web Bug Servers

[Matthew Davis]

This question was asked many years ago, but I have not seen and answer.  
Is there a collection of "Known Web Bug Servers" out there?  In addition 
to msgtag.com, I have found advmailservice.com to also be a Web Bug 
service (front end is pointofmail.com).  Are there any more out there?

Thanks
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Matthew Davis

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