Mailing (noun)

1. The act of sending or delivering letters, packages, or other mail.
2. A shipment of letters, packages, or other mail.
3. A promotional or advertising campaign that involves sending materials through the mail.

Origin:

Late 19th century: from mail + -ing.

Examples:

1. She made a special trip to the post office to send out the latest mailing.
2. The mailing list was updated to include all of the recent subscribers.
3. The charity received a generous response to their latest mailing.
4. The mass mailing of political flyers caused a stir in the community.
5. The company's quarterly newsletter was the highlight of the latest mailing to their customers.