to obtain something means to get somehting
mail is one_method_of_receiving_information. obtainment is acquiring. one_way_to_get_money is work. obtainment is not acquiring. money is means_to_get_things_done. directions_to_get_somewhere is not how_to_thing. receiving_e_mail is receiving. attainment is arrival. receiving_information_by_telephone is receiving. directions_to_get_somewhere is how_to_thing.