mail ‧ ing /ˈmeɪlɪŋ/ BrE AmE noun
1 . [countable] something that is sent to people by post, especially to advertise something:
A catalogue and order form are included with this mailing.
A mailing had gone out to every school in the country.
2 . [uncountable and countable] the process of sending something to people by post:
A very effective mailing of product samples was carried out last year.
mailing costs