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

by cybermax-tools Your server? Claim it

answering

Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun is answering right now. Last checked 12 min ago.

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

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 16 days of history · worst day 99%

16 days agonow

98.9%

Uptime 24h

90 of 91 checks

—

Tools

hidden behind auth

336 ms

Response time

average over 24h

API key

Access

streamable-http

Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun missed 2 checks this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add send-email --transport http https://mcp.apify.com?tools=cybermax/send-email

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "send-email": {
      "url": "https://mcp.apify.com?tools=cybermax/send-email"
    }
  }
}

~/.codex/config.toml

[mcp_servers.send-email]
url = "https://mcp.apify.com?tools=cybermax/send-email"

.cursor/mcp.json

{
  "mcpServers": {
    "send-email": {
      "url": "https://mcp.apify.com?tools=cybermax/send-email"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "send-email": {
      "url": "https://mcp.apify.com?tools=cybermax/send-email"
    }
  }
}

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

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.apify.com?tools=cybermax/send-email	streamable-http	needs key	839 ms	12 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: 98.9% 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 90 of 91 checks got a reply (98.9%), average response time 336 ms. The bar chart above shows every period we have measured.

Is Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

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 336 ms on average, which is faster than 41% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.