---
type: guide
title: "What Is EDDM? Meaning, Cost & USPS Rules"
description: "What is EDDM? Learn how Every Door Direct Mail works: USPS rules, postcard sizes, route targeting, and real costs per piece. See if EDDM fits your campaign."
resource: https://www.4over4.com/guide/what-is-every-door-direct-mail-eddm
tags: ["guide"]
timestamp: 2026-07-20T18:54:40.856Z
---

# What Is EDDM? Meaning, Cost & USPS Rules

What is EDDM? Learn how Every Door Direct Mail works: USPS rules, postcard sizes, route targeting, and real costs per piece. See if EDDM fits your campaign.

See [all guide concepts](index.md).

- Page type: guide
- URL: https://www.4over4.com/guide/what-is-every-door-direct-mail-eddm