To conduct the study, Silverpop evaluated emails sent by 2,787 brands from 40 different countries throughout 2012.
ເພື່ອດໍາເນີນການສຶກສາ, Silverpop ໄດ້ຕີລາຄາອີທີ່ສົ່ງຈາກ 2,787 ຍີ່ຫໍ້ຈາກ 40 ປະເທດຕ່າງໆໃນປີ 2012.