Focus on the pronunciation of mailing
English definition of “mailing”
/ˈmeɪlɪŋ/ noun [C] COMMUNICATIONS, MARKETING
› (UK also mailout, UK also mailshot) the act of sending letters, packages, or electronic messages to a lot of people at one time: If you received a mailing of a 38-page brochure, it's because you signed up at one of our stores. A second mailing had a big impact on increasing return rates.
› US (UK mailshot) a paper advertisement sent to homes or businesses: I've got 1,500 mailings that have to get out before the evening post. → See also direct mailing, mailer, mass mailing