The term “trap” is very appropriate, in that these addresses are out there to catch people either not using proper list building practices, people harvesting emails, purchasing lists from a 3rd party, or marketers who have very poor list hygiene (whether knowingly or not*). The 1st kind are used by ISPs and are usually addresses that have been dormant for a long period of time and this can vary anywhere from a few years to as little as 6 months.…