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# Masquerading rules

## Introduction

We are sometime facing a difficult problem. Email messages are going out on the internet with improper return address. Much too often, there is little we can do, because the system originating these messages can't be corrected, for all sort of reason. Masquerading rules offers a way to fix the problem at the mail gateway.

## 1. Principles

- 1.1 This rule is active
- 1.2 from
- 1.3 new from
- 1.4 Comment

## 2. Some examples

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