SERVER

Email Inbox API + Sending by Sendmux

Rank #496

io.github.Sendmux/sendmux-mcp

AI email inbox and sending tools with attachments, search, live events, and webhooks.

19 versions

65 GitHub stars

by Sendmux (1 servers)View repository ↗

First listed

Jun 19, 2026

Last publish date

Oct 2, 2026

PURPOSE

What you can do with Email Inbox API + Sending by Sendmux

Email Inbox API + Sending by Sendmux is a Model Context Protocol (MCP) server published by Sendmux. It ranks #496 of 144,396 active servers on MCP Toplist, and its repository has 65 GitHub stars. Email Inbox API + Sending by Sendmux is listed across 3 registries — Official MCP, Glama and mcp.so, with 19 tracked versions. It was first listed on Jun 19, 2026 and most recently updated on Oct 2, 2026.

Not verifiedMCP Toplist has not yet written a checked profile for this server, so the paragraph above is assembled from registry data only. The repository README is the authority on what it does.

CAPABILITIES AND LIMITATIONS

What Email Inbox API + Sending by Sendmux can and cannot do

Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.

REQUIREMENTS

What you need before using Email Inbox API + Sending by Sendmux

DeclaredNo credentialsNo credentials declared

The registry listing declares no required environment variables or authentication. This is declared metadata, not a verified install — the repository README is the authority.

MCP Toplist probed the public endpoint on Oct 6, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.

Declared by Glama, last synced Oct 16, 2026. Not independently verified by MCP Toplist.

Declared in the registry install config

SENDMUX_MCP_SURFACES · required
SENDMUX_MAILBOX_API_KEY · required
SENDMUX_MANAGEMENT_API_KEY · required
SENDMUX_SENDING_API_KEY · optional

Hosted endpoint declared as public.

INSTALLATION AND FIRST TASK

Connect Email Inbox API + Sending by Sendmux and confirm it works

Remote · HTTP

claude mcp add --transport http sendmux-mcp https://mcp.sendmux.ai/mcp

npm package

claude mcp add sendmux-mcp -- npx -y sendmux-mcp

Python package (PyPI)

claude mcp add sendmux-mcp -e "SENDMUX_MCP_SURFACES=<your SENDMUX_MCP_SURFACES>" -e "SENDMUX_MAILBOX_API_KEY=<your SENDMUX_MAILBOX_API_KEY>" -e "SENDMUX_MANAGEMENT_API_KEY=<your SENDMUX_MANAGEMENT_API_KEY>" -e "SENDMUX_SENDING_API_KEY=<your SENDMUX_SENDING_API_KEY>" -- uvx sendmux-mcp

Replace each placeholder with your own value before saving.

Remote · HTTP

[mcp_servers.sendmux-mcp]
url = "https://mcp.sendmux.ai/mcp"

Add to ~/.codex/config.toml.

npm package

[mcp_servers.sendmux-mcp]
command = "npx"
args = ["-y", "sendmux-mcp"]

Add to ~/.codex/config.toml.

Python package (PyPI)

[mcp_servers.sendmux-mcp]
command = "uvx"
args = ["sendmux-mcp"]

[mcp_servers.sendmux-mcp.env]
SENDMUX_MCP_SURFACES = "<your SENDMUX_MCP_SURFACES>"
SENDMUX_MAILBOX_API_KEY = "<your SENDMUX_MAILBOX_API_KEY>"
SENDMUX_MANAGEMENT_API_KEY = "<your SENDMUX_MANAGEMENT_API_KEY>"
SENDMUX_SENDING_API_KEY = "<your SENDMUX_SENDING_API_KEY>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

Remote · HTTP

https://mcp.sendmux.ai/mcp

Settings → Connectors → “Add custom connector”, then paste this URL.

npm package

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp"
      ]
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config).

Python package (PyPI)

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<your SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<your SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<your SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<your SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "mcpServers": {
    "sendmux-mcp": {
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project).

npm package

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp"
      ]
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project).

Python package (PyPI)

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<your SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<your SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<your SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<your SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "servers": {
    "sendmux-mcp": {
      "type": "http",
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

Save as .vscode/mcp.json in your workspace.

npm package

{
  "servers": {
    "sendmux-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp"
      ]
    }
  }
}

Save as .vscode/mcp.json in your workspace.

Python package (PyPI)

{
  "servers": {
    "sendmux-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<your SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<your SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<your SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<your SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "mcpServers": {
    "sendmux-mcp": {
      "serverUrl": "https://mcp.sendmux.ai/mcp"
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

npm package

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp"
      ]
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Python package (PyPI)

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<your SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<your SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<your SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<your SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "mcpServers": {
    "sendmux-mcp": {
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

npm package

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp"
      ]
    }
  }
}

Python package (PyPI)

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<your SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<your SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<your SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<your SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

First successful task

After adding the config, ask your client to list this server's tools. A tool list confirms the connection; an empty list or an error means the server did not start or needs credentials.

MAINTENANCE AND EVIDENCE

What changed, and when this was checked

First listed: Jun 19, 2026
Latest version published: Oct 2, 2026
Version history: 19 versions tracked (below)
Requirements evidence: MCP Toplist probed the public endpoint on Oct 6, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.
Profile checked: Not yet — purpose, capabilities and requirements above come from registry data only
Ranking data as of: Oct 16, 2026

Registry sightings

Glama ↗listed since Jun 19, 2026 · still listed
Official MCP ↗listed since Jul 24, 2026 · still listed
mcp.so ↗listed since Aug 26, 2026 · still listed

Do you maintain Email Inbox API + Sending by Sendmux? to correct or enrich this profile.

VERSIONS

Available versions (19)

Version	Published
2.2.0	Oct 2, 2026
2.1.4	Sep 30, 2026
2.1.3	Sep 21, 2026
2.1.2	Sep 19, 2026
2.1.1	Sep 17, 2026
2.1.0	Sep 16, 2026
2.0.0	Sep 15, 2026
1.8.0	Sep 10, 2026
1.7.0	Sep 8, 2026
1.6.1	Aug 19, 2026
1.6.0	Aug 18, 2026
1.5.0	Jul 22, 2026
1.4.0	Jul 8, 2026
1.3.1	Jul 3, 2026
1.3.0	Jul 3, 2026
1.2.1	Jul 2, 2026
1.2.0	Jul 1, 2026
1.1.4	Jun 19, 2026
1.1.3	Jun 19, 2026

STANDING

#496of 144,396 active serversTop 0.5%

Ranks ahead of 143,900 of 144,396 servers on MCP Toplist.

BADGE

Show your rank

Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.

Markdown

[![MCP Toplist](https://mcptoplist.com/badge/io.github.Sendmux%2Fsendmux-mcp.svg)](https://mcptoplist.com/server/io.github.Sendmux%2Fsendmux-mcp)

HTML

<a href="https://mcptoplist.com/server/io.github.Sendmux%2Fsendmux-mcp"><img src="https://mcptoplist.com/badge/io.github.Sendmux%2Fsendmux-mcp.svg" alt="MCP Toplist: Top 1% of 144,396" /></a>

Variants: append ?metric=score or ?metric=stars to the image URL.

FAQ

Frequently asked questions

Who maintains Email Inbox API + Sending by Sendmux?: Email Inbox API + Sending by Sendmux is maintained by Sendmux, which publishes 1 MCP server (19 total versions) tracked on MCP Toplist.
Is Email Inbox API + Sending by Sendmux listed on the Official MCP Registry?: Yes — Email Inbox API + Sending by Sendmux is listed on the Official MCP Registry, alongside Glama and mcp.so.
How many versions does Email Inbox API + Sending by Sendmux have?: MCP Toplist tracks 19 versions of Email Inbox API + Sending by Sendmux, most recently published on Oct 2, 2026.
Where can I find the source code for Email Inbox API + Sending by Sendmux?: The source code for Email Inbox API + Sending by Sendmux is hosted at github.com/Sendmux/sendmux-sdk.

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