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Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun MCP Server

by workers-cybermax-tools-cybermax Your server? Claim it
answering

Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun is answering right now. Last checked 4 min ago.

Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark

Uptime history 23 hours of history
23 hours agonow
100.0%
Uptime 24h
87 of 87 checks
—
Tools
hidden behind auth
324 ms
Response time
average over 24h
API key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

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Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add send-email --transport http https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "send-email": {
      "url": "https://mcp.apify.com/?tools=cybermax/send-email\u0026via=mcp-registry"
    }
  }
}
~/.codex/config.toml
[mcp_servers.send-email]
url = "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry"
.cursor/mcp.json
{
  "mcpServers": {
    "send-email": {
      "url": "https://mcp.apify.com/?tools=cybermax/send-email\u0026via=mcp-registry"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "send-email": {
      "url": "https://mcp.apify.com/?tools=cybermax/send-email\u0026via=mcp-registry"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but you need an API key from its owner to call it.

Endpoints

URLTransportStateLatencyChecked
https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry streamable-http needs key 318 ms 4 min ago

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Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun — questions

Answers built from our own checks of this server.

Why is there no tool list for Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun?
The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.
Is Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 87 of 87 checks got a reply (100.0%), average response time 324 ms. The bar chart above shows every period we have measured.
How do I connect Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own key: it refuses anonymous clients.
Does Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun need an API key?
Yes. Every time we knock, Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.
How fast is Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun?
It answers our handshake in 324 ms on average, which is faster than 43% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.