mailshot
noun [ C ]
MARKETING UK (also mail shot) uk/ˈmeɪlʃɒt/ usan act of sending letters, packages, or electronic messages to a lot of people at one time:
Maybe a mailshot should be sent to all customers to notify them of the product changes.
a paper advertisement sent to homes or businesses:
I often get mailshots from insurance companies about savings schemes.
See also
mailing