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PGP stands for Pretty Good Privacy. It is supported via special software plug-ins that have to be downloaded for most e-mail applications. It is not really an ISP service per se; for it to work both the sender and receiver must have PGP installed, and it can hide the e-mail message from everyone except the sender and receiver (including the ISP provider). While it cannot 100% guarantee full privacy and ISP safety (nothing does) it does come about as close as anything can.