Express instruction by a customer, or a recipient of a mail, email, or other direct delivery to stop the marketer from sending a merchandise, information, or more messages. For example, some book clubs automatically send the 'Book Of The Month' to their members unless they notify the club (within a specified period) not to send it. Responsible online marketers include opt out instructions in their messages or at their sites. See also opt in.
Use opt out in a sentence