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Currently working on an application in which we are trying to gather IP address from people spying on other people's inboxes. The way we have it at the moment we create a ''honeypot'' email which contains a unique link and soon as the snooper clicks on it we get their IP address. This works fine.
But just looking for different methods as in maybe so that the snooper doesnt have to click on link but we directly gather their IP as soon as he opens the email, or also ive heard something about having pictures in emails to gather IP addresses ? Any help would be great.
Most clients these days block remote images unless the email address of the sender is in their address book. Flash or Java may be the best bet, but even then, that's iffy.
Sangging IPs is also a very unreliable identification mechanism. A users IP can change frequently depending on their ISP (AOL for example shuffles users through their farms and the users IP changes frequently).