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S/MIME is used to securely encrypt e-mail messages. Many e-mail applications have support for it built-in. To enable it, one must obtain a security certificate (they're available for free). S/MIME is not really an ISP safety service per se; for it to work both the sender and receiver must have both S/MIME capabilities in their e-mail software and valid certificates. It can hide the e-mail message from everyone except the sender and receiver (including the ISP provider). While it cannot guarantee 100% full privacy and ISP safety (nothing does) it does come about as close as anything can.