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Advertising mail, also known as direct mail (by its senders), junk mail (by its recipients), mailshot or admail (North America),^[1][2][3] letterbox drop^[4][5] or letterboxing (Australia),^[6] is the delivery of advertising material to recipients of postal mail. The delivery of advertising mail forms a large and growing service for many postal services, and direct-mail marketing forms a significant portion of the direct marketing industry. Some organizations attempt to help people opt out of receiving advertising mail, in many cases motivated by a concern over its negative environmental impact.

Advertising mail includes advertising circulars, plastic mailers, coupon envelopes (Money Mailer, Valpak), catalogs, CDs, "pre-approved" credit card applications, and other commercial merchandising materials delivered to homes and businesses. It may be addressed to pre-selected individuals, or unaddressed and delivered on a neighbourhood-by-neighbourhood basis.^[7]