A mailroom is a designated space in a large building, like an office, hospital, or university, where incoming and outgoing mail gets sorted and distributed. Think of it as the central hub where all the letters, packages, and deliveries arrive before being delivered to the right person or department.

In a big company with hundreds of employees spread across multiple floors, mailroom workers receive deliveries from postal carriers and courier services, then organize everything by department or individual name. They might use carts to wheel stacks of mail to different floors, or employees might come to the mailroom to pick up their packages. The mailroom also handles outgoing mail, weighing packages, printing postage, and getting everything ready for pickup.

Mailrooms used to be much busier before email became common. In the 1980s, a company's mailroom might process thousands of physical letters every day. Today, while email has reduced the volume of paper mail, mailrooms still handle important legal documents, contracts, checks, and a steady stream of packages from online orders. Many successful business leaders started their careers working in mailrooms, learning how their companies operated from the ground up.