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mcp4mail MCP server

Which MCP servers are mcp4mail's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-26

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Whose server it is
  • Registry nameonline.mcp4mail/mcp4mailverified in the MCP registry

The registry name sits under mcp4mail.online. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-26
  • Staterequires sign-inchecked 2026-10-26

On 2026-10-26 the server answered and asked for a sign-in with a mcp4mail account (OAuth). It shows its tool list only to signed-in users, so we list none here.

Should an agent connect itNot proven either way yet
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • Signs in by OAuth: the client opens the sign-in on first connect.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 1, the first on 2026-10-26
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer798 ms
  • Sign-inOAuth: the client signs you in

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "mcp4mail": {
      "type": "http",
      "url": "https://mcp4mail.online/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http mcp4mail https://mcp4mail.online/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp4mail.online/mcp as a custom connector in the settings.

The first time it connects, the client opens a mcp4mail sign-in.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.