mailer

noun4

1. •
   One who sends mail.

   • Large and frequent mailers may send material on a monthly basis to their house lists, test acquisitions several times a year to drum up new donors, and perhaps do a few special appeals on top of that. — 2009
2. •
   A computer program that sends electronic mail.
3. •
   A packet or container designed for postal use.

   • The cassette came in a brown paper mailer.
4. •
   A mailshot; advertising sent by mail.

   • Do they recall your latest mailer? Did you ever sell an armoire through ads on hard-rock radio? Find out with low-cost "intercept" surveys of customers as they leave the store. — 1982