Outbound Data Loss Prevention (DLP)

Compatibility

Outbound DLP is only compatible with Microsoft 365.

Outbound Data Loss Prevention ensures the protection of sensitive information in outbound emails with Cloudflare Data Loss Prevention (DLP). Outbound Data Loss Prevention integrates with your inbox, and it proactively monitors your email to prevent unauthorized data leaks.

Get started

To begin using outbound DLP, install the Cloudflare add-in in Microsoft 365:

1. In Zero Trust ↗, go to Email Security > Outbound DLP.
2. In Protect sensitive data in outbound emails, select Get started.
3. Select Download add-in to download the Cloudflare add-in.
4. Configure Microsoft 365 to use the Cloudflare add-in:
   1. In the Microsoft 365 Apps admin center ↗, go to Microsoft 365 Admin Center > Settings > Integrated Apps.
   2. Select Upload custom apps. For the application type, choose Office Add-in.
   3. Select Upload manifest file (.xml) from device.
   4. Upload the Cloudflare add-in file.
   5. Verify and complete the wizard.
5. Confirm the Cloudflare add-in was configured in Microsoft 365.

After configuring the Cloudflare add-in in Microsoft 365, you can select Add a policy to create an outbound DLP policy.

Note

The Cloudflare add-in can take up to 24 hours to propagate after install.

Create an outbound policy

An outbound policy allows you to control outbound email flow.

To create an outbound DLP policy:

1. In Zero Trust ↗, go to Email Security > Outbound DLP.

2. Select Add a policy.

3. Name your policy.

4. Build an expression to match specific email traffic. For example, you can create a policy that blocks outbound emails containing identifying numbers:

   Selector	Operator	Value	Logic	Action
   Recipient email	not in	example.com	And	Block
   Matched DLP profile	in	Social Security, Insurance, Tax, and Identifier Numbers

5. (Optional) Choose whether to use the default block message or a custom message.

6. Select Create policy.

After creating your policy, you can modify or reorder your policies in Email Security > Outbound DLP.

Selectors

Selector	Description
Recipient email	The intended recipient of an outbound email.
Email sender	The user in your organization sending an email.
Matched DLP profile	The DLP profile that content of an email matches upon scan.

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