A hashbuster is a section of random text included in spam, possibly hidden as invisible text using HTML. The purpose of including hashbusters is to try and defeat Bayesian spam filtering, to make each individual spam look as different as possible. Including hashbusters in email is a sure sign that the email is spam, that it's sent by a spammer, and that the spammer knows that they are sending spam. This practice is always prohibited by any legitimate ESPs or affiliate marketing programs.

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