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I hate it when people forward crap emails on to me but leave all the barnacles on, you know, those "This message may contain information that is of a confidential nature ........." bits on the end of emails that just add size to an email with no value. Has anyone ever heard of a court case where a barnacle made any difference to the outcome?
Also I dislike those that don't delete the last list of victims, sorry, recipients, so any spammer can harvest a pile of addresses, including mine, to spam.