# Enable primary DLP Gateway mail flow rule in Exchange Online

## Introduction

This page covers the activation of the primary mail flow rule for DLP Gateway in Exchange Online, which will be responsible for routing selected email traffic to Zivver.

## Getting started

1. Go to the [Exchange Admin Center](https://admin.exchange.microsoft.com/).
2. Click on _mail_outline_ **Mail flow** in the menu on the left.
3. Click on **Rules**.

## Enable the primary mail flow rule

1. Click on `Zivver: Outbound DLP` in the overview on the **Rules** page. In the side pane that opens, under **Enable or disable rule**, toggle the switch to **Enabled**.
2. Wait while the side pane shows **Updating the rule status, please wait…**.
3. When the side pane shows **Rule status updated successfully**, the mail flow rule is now enabled.

Every outbound message that satisfies the configured conditions will be relayed to the Zivver SMTP Server.

Updated on 2025-08-15