First (and easiest) thing to forge is the e-mail return address. Most personal computer posting software lets you type in just about any e-mail address you want to (for example the software I am using to post this message). Unless someone is a real idiot or they truly don"t know they will annoy tons of people, they will forge a fake e-mail return or put in the e-mail of someone they don"t like. It seems that most machines will accept e-mail from any other machine, so don"t send e-mail to postmasters at "upstream" sites that are just passing the message along.
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