1. the sender of a letter or package by mail: North American"mailers of Christmas cards"
▪ a person employed to dispatch newspapers or periodicals by mail: "walkouts by mailers and pressmen at the newspaper continued"
▪ a free advertising pamphlet, brochure, or catalog sent out by mail: "the coupons will be included in newspaper inserts and mailers"
▪ a container used for conveying items by mail, especially a padded envelope or protective tube: "they didn't fill in their name and address on the mailer"
