Dumb pipes, smart endpoints-the Post Filter, the register to stop unwanted mail

Many people receive mail at their front door that they do not want to receive. Commercial mail, mail from companies they may perhaps made enquiries with long ago, mail addressed to people who used to live at the address. Mail that should be blocked — like email ending up in a spam or folder. Except that in the case of paper based mail, we do not want to have that junk folder in our house, making it still our problem to dispose of.