accept hosts = :
  accept hosts = +relay_from_hosts
  drop condition = ${if match{$sender_helo_name}{MY_IP}{yes}{no} }
       message   = "Dropped spammer pretending to be us"
  drop condition = ${if match{$sender_helo_name}{^[0-9]\.[0-9]\.[0-9]\.[0-9]}{yes}{no} }
       message   = "Dropped IP-only or IP-starting helo"
  drop condition = ${if match{$sender_helo_name}{dsl|dialup|pool|peer|dhcp|dynamic|asianet}{yes}{no} }
       message   = "Dropped dynamic host helo"
  drop condition = ${if match{$sender_helo_name}{localhost}{yes}{no} }
       message   = "Dropped spammers pretending to localhost"