I originally posted this at http://www.318.com/TechJournal Ever get an email from yourself that you didn’t send? Ever get spam from someone that you can’t reply to? Using the settings of an email program, it is possible to pretend to be anyone that you would like. If you want to send email from bill.gates@microsoft.com then that is entirely possible. Finding the address of who actually sent email is easy, but ensuring the identity of the sender is not part of standard email. This is where the protocols for PGP, Pretty Good Privacy, and GPG, or GNU Privacy Guard, come into play. GPG and PGP are Open Source suites of applications allowing…