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English definition of “mailer”

mailer

noun [C]     /ˈmeɪlər/ COMMUNICATIONS
(UK mailshot) a paper advertisement sent to homes or businesses: An election mailer reached three million homes. The direct mailer we produced was sent out to 250 members. → See also mailing
a company, person, or software program that sends lots of letters or messages, especially many copies of the same thing: bulk/junk/mass mailer The junk mailer was fined for sending billions of messages without permission from the recipients.
US a special envelope or container for sending things that can easily break, have an unusual shape, or are very small: Robert copied the files onto a disk, put a label on it, and put it in a mailer. → Compare postal packet
(Definition of mailer noun from the Cambridge Business English Dictionary © Cambridge University Press)
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