Marketing & Ads

Inbox Preview

by Powerline · powerline.ai/inbox-preview

Preview how emails render in Gmail, Outlook and Yahoo with screenshots

Renders HTML emails and raw .eml files in real Gmail, Outlook and Yahoo web clients, capturing screenshots to show how messages appear in inboxes and when opened. Helps verify email design and rendering before sending campaigns.

Try asking Muse: "Show me how this email campaign will look when my customers open it in Gmail and Outlook"

Working now?

Working

Worked last 7 days

98.1% of checks

How to get it

Extra setup

Account

No account needed

Price

Not stated

Source: Found in the official MCP Registry (ai.powerline/inbox-preview) · First listed September 24, 2026

Last 24 hours

Each bar is one check, every 15 minutes. Green means it answered. Last checked 7 min ago.

Is it safe to connect?

What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.

Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.

musedirectory.ai is not part of Meta. More about how Muse handles your information

How to add it to Muse

Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Paste this into Muse

Use Inbox Preview to help me. It is a free service with an MCP server at https://api.powerline.ai/v1/mcp. It does not need an API key. Ask me before you share anything with it.

Open Muse

https://api.powerline.ai/v1/mcp

Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.

Technical details: safety screening, tools, response time and recent checks

Response time at the last check: 886ms. Worked in 98.1% of checks over 30 days.

Screening · September 24, 2026

Screened, no issues found

MCP handshake

Pass

Answered in 580ms

Domain against threat feeds (Cloudflare security DNS)

Pass

api.powerline.ai, powerline.ai not flagged

Published packages against the OSV malicious-package database

n/a

No npm or PyPI package published

Hidden instructions or invisible characters in tool text

Pass

4 tools read, nothing found

Inputs asking for passwords, card numbers or seed phrases

Pass

None found

Domain and redirects

Pass

Domain registered 2246 days ago

AI review of purpose and tool behavior

Pass

No concerns

Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.

Tools · 4

list_clientsList the email clients this deployment can render right now, with their rendering tier, engine, and capabilities

submit_previewSubmit an email for rendering across email clients — full HTML, or a complete raw .eml (base64). Provide exactly one of html/eml. Returns a job ID to poll for results.

get_jobGet the status and screenshots for a preview job. Poll until status is "completed".

get_screenshotFetch a rendered screenshot. Returns the image URL for the given job, client, width, and environment (color scheme / images).

Recent checks

2026-09-28 09:01:34live · HTTP 200886ms

2026-09-28 06:45:56live · HTTP 2001337ms

2026-09-28 04:30:49live · HTTP 2001161ms

2026-09-28 02:01:06live · HTTP 200182ms

2026-09-27 23:45:56live · HTTP 2001038ms

2026-09-27 21:30:41live · HTTP 200568ms

2026-09-27 19:01:14live · HTTP 2001848ms

2026-09-27 16:46:06live · HTTP 200712ms

2026-09-27 14:46:10live · HTTP 2002748ms

2026-09-27 12:30:59live · HTTP 2001694ms

2026-09-27 10:02:02live · HTTP 200666ms

2026-09-27 07:46:02live · HTTP 2001937ms

Link

https://api.powerline.ai/v1/mcp

Questions about Inbox Preview in Muse

How do I connect Inbox Preview to Muse?

Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Inbox Preview to help me. It is a free service with an MCP server at https://api.powerline.ai/v1/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Is Inbox Preview working right now?

At the last check (September 28, 2026, 09:01 UTC) the endpoint was working, answering in 886ms. Over the last 7 days it answered 98.1% of health checks. It is checked every 15 minutes.

Is Inbox Preview safe to connect to Muse?

It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.

What can Inbox Preview do in Muse?

It exposes 4 tools, including list_clients, submit_preview, get_job, get_screenshot. For example, you could ask Muse: "Show me how this email campaign will look when my customers open it in Gmail and Outlook"

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Is this yours?

This listing was added from public sources (Found in the official MCP Registry (ai.powerline/inbox-preview)). If you build Inbox Preview, claim it to correct the details and get your badge.

Claim this listing

Paste this on your site or README. It always shows the latest check.

<a href="https://musedirectory.ai/connector/inbox-preview"><img src="https://musedirectory.ai/badge/inbox-preview.svg" alt="Inbox Preview on musedirectory.ai" width="236" height="40"></a>

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