---
title: Open email attachments with Browser Isolation
description: A new attachment section in Email security allows you to safely open attachments to view and investigate.
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Open email attachments with Browser Isolation

May 15, 2025 

[ Email security ](https://developers.cloudflare.com/cloudflare-one/email-security/) 

You can now safely open email attachments to view and investigate them.

What this means is that messages now have a **Attachments** section. Here, you can view processed attachments and their classifications (for example, _Malicious_, _Suspicious_, _Encrypted_). Next to each attachment, a **Browser Isolation** icon allows your team to safely open the file in a **clientless, isolated browser** with no risk to the analyst or your environment.

![Attachment-RBI](https://developers.cloudflare.com/_astro/Attachment-RBI.U9Dp8dJO_265xjw.webp) 

To use this feature, you must:

* Turn on **Allow users to open a remote browser without the device client** in your Zero Trust settings.
* Have **Browser Isolation (BISO)** seats assigned.

For more details, refer to our [setup guide](https://developers.cloudflare.com/cloudflare-one/remote-browser-isolation/setup/clientless-browser-isolation/).

Some attachment types may not render in Browser Isolation. If there is a file type that you would like to be opened with Browser Isolation, reach out to your Cloudflare contact.

This feature is available across these Email security packages:

* **Advantage**
* **Enterprise**
* **Enterprise + PhishGuard**

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