Email Preflight

Name: Email Preflight
Author: tasuyoapp-ctrl

by tasuyoapp-ctrlversion 0.3.0i★ –iRuns in the cloud

Registry nameio.github.tasuyoapp-ctrl/email-preflight

How to install

Overview

Description from the maker (original English)

x402 v2 payment requests; relays compatible clients' signed payments to the existing product API.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Chat & email

Install

Pick the AI app you use, then copy the settings.

Passed 2/3 checks · What you ask goes through the maker’s server (email-preflight-mcp.onrender.com)

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 2 min

No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1

Open Claude’s Connectors page
CustomizeConnectors
Done
Click “+ Add” → “Add custom connector” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameEmail Preflight
Remote MCP server URL · Addresshttps://email-preflight-mcp.onrender.com/mcp
Leave Authentication as Claude detected it, then click Add
Done
Turn it on in a chat
+ConnectorsEmail Preflight
Done
Try it
Use Email Preflight and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Email Preflight or shows a Email Preflight tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with ChatGPT on business plans only

ChatGPT Business, Enterprise or Edu on the web, added by a workspace admin or owner · On Free, Plus or Pro: your ChatGPT plan cannot connect MCP yet

Open ChatGPT’s add-MCP page on the web
Plugins+Add custom MCP server
Done
Fill in the name and address
Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin
Name · NameEmail Preflight
Connection · Addresshttps://email-preflight-mcp.onrender.com/mcp
Done
Pick Email Preflight in a chat
Start a new chat and pick Email Preflight from your plugins before typing
Done
Try it
Use Email Preflight and tell me what you can do for me, then show me one thing
✓ If ChatGPT says it is using Email Preflight or shows a Email Preflight tool in the answer, you are connected

Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Claude Code · about 2 min

No key, nothing to install

Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --transport http email-preflight https://email-preflight-mcp.onrender.com/mcp

Done

Type /mcp in Claude Code
You should see Email Preflight listed as connected
Done
Try it
Use Email Preflight and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Email Preflight or shows a Email Preflight tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 2 min

No key, nothing to install

Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Email Preflight and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Email Preflight or shows a Email Preflight tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 2 min

No key, nothing to install

Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Email Preflight and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Email Preflight or shows a Email Preflight tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://email-preflight-mcp.onrender.com/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use Email Preflight💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport http email-preflight https://email-preflight-mcp.onrender.com/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "email-preflight": {
      "url": "https://email-preflight-mcp.onrender.com/mcp"
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "email-preflight": {
      "type": "http",
      "url": "https://email-preflight-mcp.onrender.com/mcp"
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: –
Downloads per weeki: Not on npm/PyPI
Licence i: No licence stated
Connection: Runs in the cloud
Transport: streamable-http
Latest versioni: 0.3.0
Categoryi: Chat & email
Published to registryi: Oct 16, 2026
Code last changedi: –
Maker: tasuyoapp-ctrl
Repo: –
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

Claude ChatGPT Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

All apps, with pros and cons →

What it can do

Tool names and descriptions exactly as the server reported them on Nov 8, 2026. The maker wrote them, not us; we show them as plain text.

email_preflight
Use before sending or processing an email when you need current preflight facts about the address. For $0.001 USDC on Base mainnet, the existing Email Preflight API checks six facts: syntax validity, domain availability, MX availability, disposable-email detection, role-account d
email_check_mini
Check email syntax, MX and local domain classes with the existing API. $0.001 USDC on Base mainnet. MX does not prove mailbox existence. Unpaid calls return x402 v2 requirements for this request. A compatible client may repeat identical arguments with its own PaymentPayload in pa
url_preflight
Inspect public HTTP/HTTPS URL response metadata through the existing safe URL API. $0.001 USDC on Base mainnet. Unpaid calls return x402 v2 requirements. A compatible client may repeat the identical url argument with its own signed PaymentPayload in params._meta["x402/payment"].

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 11, 2026

! Caution
Maker matches the repo
The publisher (tasuyoapp-ctrl) is not the repo owner (tasuyoapp-ctrl); someone else may have listed it
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✓ Pass
Endpoint responds
Responded in 267 ms (HTTP 200)
– Not applicable
Sign-in with OAuth
No sign-in needed
✓ Pass
No hidden instructions in tool descriptions
Read 3 tool descriptions and found no hidden instructions to the AI

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Chat & emaili

More stars than 0% of the other 1938 servers in this category
Published to the registry more recently than 52% of the other 1938 servers in this category
Basic checks equal to or better than 48% of the other 1938 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Email Preflight safe?

It passed 2 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.3.0) reached the registry 26 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT Business and above.

What can I use instead?

In the same category: Inbox Zero, Agent-Native Chat, draw.io

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Inbox Zero

Search Gmail and Outlook, save drafts, manage email rules, and view email stats.

by elie222Widely used★ 13KUpdated 41 days ago

Runs in the cloud

Install

Agent-Native Chat

Minimal chat-first app with durable threads, actions, and the app-agent loop

by BuilderIOWidely used★ 7.7K Stars for the whole repoUpdated 2 months ago

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Install

draw.io

Create draw.io diagrams in chat from Mermaid or XML, shown live and interactive. 10,000+ shapes.

by jgraphWidely used★ 5.8KUpdated today

Runs in the cloud✓ draw.io

Install

README from the maker

No README found in the repo

Email Preflight

Overview

What you can do with it

Install

Open Claude’s Connectors page

Click “+ Add” → “Add custom connector” and fill in these 2 fields

Turn it on in a chat

Try it

Open ChatGPT’s add-MCP page on the web

Fill in the name and address

Pick Email Preflight in a chat

Try it

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Over the web

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Chat & emaili

Common questions

Alternatives

Inbox Zero

Agent-Native Chat

draw.io

README from the maker