MCP server

Email Inbox API + Sending by Sendmux

io.github.Sendmux/sendmux-mcp

Checked 26 Oct 2026, 08:29 UTC · It answered and asked for a sign-in

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

Signs in with your accountOfficial: sendmux.ai's GitHub account (Sendmux)

https://mcp.sendmux.ai/mcp

At a glance

Type: MCP server
Publisher: sendmux.ai (verified by the MCP Registry)
Status: Signs in with your account
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add sendmux-mcp https://mcp.sendmux.ai/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"sendmux-mcp","server_url":"https://mcp.sendmux.ai/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"sendmux-mcp","server_url":"https://mcp.sendmux.ai/mcp"}

Signs in with your account: your agent app opens a sign-in page the first time you use it.

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Email inboxes for AI agents: send, receive, search, drafts with owner approval, and webhooks.
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SalesBlink Cold Email
Cold email sequences, leads, templates, senders, inbox, and analytics via the SalesBlink API.
Primitive Email
Email infrastructure for AI agents — send, receive, search, and reply to email over MCP.
Openhook
Webhook, email and DNS inboxes for AI agents to capture callbacks and test integrations.
Outlook Mail
Outlook Mail (Microsoft 365) MCP Pack
AnyHook
A webhook inbox for agents: one call returns a live URL. Mock, verify, inspect and replay.
Ciro Cesar Maciel — Free Tools
Free, no sign-in: favicons, web to Markdown, CSV to chart, text to speech, time zones, passwords.

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