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Reply to the email... I dont think anyone will get it, but just in case...
Embed a hidden 1x1 transparent pixel image into the email, but make sure it is
loaded in the html off of your server... (that is, dont "attach it", but embded it in html)...
When the images loads from your server after they get the reply email you sent them, log the ip that they check it from as they have to have a web browser to view
the image so you may get a better IP to track that way.
(Note: the ip will show up in your web server logs so name the file uniquely so no one else will ever be able to load it)
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