---
type: help
title: "What if my mailing list has duplicates or bad addresses?"
description: "Your mailing list can be reviewed for common problems before a campaign goes out, which protects your postage budget from wasted pieces. The list can be ch"
resource: https://www.4over4.com/help/site-wide/what-if-my-mailing-list-has-duplicates-or-bad-addresses
tags: ["Products", "help"]
timestamp: 2026-07-20T18:54:40.856Z
---

# What if my mailing list has duplicates or bad addresses?

Your mailing list can be reviewed for common problems before a campaign goes out, which protects your postage budget from wasted pieces. The list can be ch

Part of the **Products** hub. See [all help concepts](index.md).

- Page type: help
- Hub: Products
- URL: https://www.4over4.com/help/site-wide/what-if-my-mailing-list-has-duplicates-or-bad-addresses