> ## Documentation Index
> Fetch the complete documentation index at: https://docs.brew.new/llms.txt
> Use this file to discover all available pages before exploring further.

# Preview an Email Across Real Inboxes

> See how a design renders in Gmail, Outlook, Apple Mail, iOS, and Yahoo before you send.

<Note>
  **July 2026** · Available on all plans.
</Note>

## What Shipped

Brew can now render any design across real email clients and devices (Gmail,
Outlook, Apple Mail, iOS with dark-mode variants, and Yahoo) and returns a
screenshot per client. Catch a broken Outlook table or a dark-mode
contrast issue before the send goes out.

<Frame>
  <img src="https://0edx89zhjrasqnjf.public.blob.vercel-storage.com/docs/preview_real_inboxes.webp" alt="Inbox previews rendered from a chat prompt in Brew" width="2924" height="2056" />
</Frame>

## How to Use It

<Steps>
  <Step title="Add the email to chat">
    Open the email you want to check and click **Add to chat**. This brings
    that design into the conversation so the preview runs against it.
  </Step>

  <Step title="Ask for a preview">
    Prompt the chat for a preview. Name specific inboxes if you have them in
    mind:

    > *"Preview this across real inboxes."*

    > *"Preview this in Gmail mobile and Apple Mail dark mode."*

    Leave it open-ended and Brew runs a default spread of Gmail, Outlook,
    Apple Mail, and iOS.
  </Step>

  <Step title="Open the full renders">
    Preview images come back per client in the chat. Click any of them to
    open the full-size render in a new tab. Slow clients show as **Pending**;
    ask again to fetch just those.
  </Step>
</Steps>

## From MCP

If Brew is [connected to your AI client](/api-reference/mcp/quickstart), previews
run from any chat. Reference the email you want checked and ask:

> *"Preview the launch email in Apple Mail and Gmail."*

The agent calls `preview_email_across_clients` and replies with the preview
images, hosted on Brew's CDN. Click any of them to open the full-size render
in your browser.

<Frame>
  <img src="https://0edx89zhjrasqnjf.public.blob.vercel-storage.com/docs/mcp_preview_inboxes.webp" alt="Claude running a Brew inbox preview over MCP, returning Apple Mail and Gmail renders" width="1594" height="1492" />
</Frame>

## From the API

The same feature is available at `POST /v1/emails/{emailId}/client-previews`
and as `brew.emails.previewClients(...)` in the TypeScript SDK. See the
[API Reference](/api-reference/api/api-introduction) for the full client
catalogue.

## Related

* [The Interface](/create-emails/the-interface)
* [Prompt Guide](/create-emails/prompt-guide)