---
description: Partner domain TLS in Email Security.
title: Partner domain TLS
image: https://developers.cloudflare.com/cloudflare-one/email-security/policies/inbound/partner-domain-tls/og.png?v=622bc2443b426bc6
---

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# Partner domain TLS

Last updated Sep 22, 2026|Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/cloudflare-one/email-security/policies/inbound/partner-domain-tls/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

To add additional TLS (Transport Layer Security) requirements for emails coming from certain domains, you can enforce higher levels of SSL/TLS inspection. If TLS is required, mail without TLS from the specified domain will be dropped.

Note

To enforce TLS across all emails, you will need to enforce TLS requirements when you are onboarding your domain. To only enforce TLS for specific emails, go to **Policies & rules** > **Inbound** > **Partner domain TLS**, then select **Add a domain**.

To set up a partner domain:

1. Log in to [Cloudflare One ↗︎](https://one.dash.cloudflare.com/) and select **Email security**.
2. Select **Policies & rules**, then go to **Inbound** > **Partner domain TLS**.
3. Select **Add a domain**.
4. Enter a valid domain name. You can also exclude subdomains by selecting **Add exclude**.
5. (Optional) Add an optional note to describe your rule(s).
6. Select **Save**.

To edit a partner domain, select the three dots > **Edit**.

To delete a partner domain, select the three dots > **Delete**.

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