Meaning of “mailer” in the English Dictionary

"mailer" in Business English

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mailernoun [ C ]

uk /ˈmeɪlər/ us 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

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.

(Definition of “mailer” from the Cambridge Business English Dictionary © Cambridge University Press)