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of course, most any geek is going to either not pick up the mail from his or her foo@freewhatever.com account or procmail it out of existance, but not if the means of getting ads is also the only place where service changes and outages are announced. :) better yet, send mails along the lines of "respond to this message within 48 hours, or your account will be automatically suspended."
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That's what procmail and perl is for.