Sent_en: 2zh Inferred consent is where the marketers have the e-mail address and send messages to those on their database, but didn't get expressed consent to send messages.
Sent_yy: 所谓推断许可，即营销者在其数据库中拥有对方的电子邮件地址并向对方发送了信息，但是并未获得收件人的明确许可。