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Email Inbox API + Sending by Sendmux

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

Connector by Sendmux · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)Remote (HTTP)★ 62
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Install

Works with Claude Code, VS Code, Codex, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/sendmux-sendmux-mcp

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Remote endpoint

  • https://mcp.sendmux.ai/mcp Remote (HTTP)

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About

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

Use cases: email

Reviews

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No reviews yet. Installed it? Reviews come from verified installers only. How reviews work

Permissions

What this server can do and what it asks for, from its tool list, install config and code. Checked Oct 25, 2026.

Tools
2 read · 3 write · 0 delete
Secrets
None asked for
Install scripts
None found
Runs as
Node.js package

Tools by what they do 5

Read from the source code; the running server may list different tools.

Read 2 · Look things up without changing anything.

  • mailbox_get_attachment
  • mailbox_read_attachment

Write 3 · Create, change, send or run things.

  • mailbox_upload_attachment
  • mailbox_wait_for_message
  • sending_upload_attachment

Network hosts it talks to 8

  • a2a.sendmux.ai · found in code
  • app.sendmux.ai · found in code
  • eu.i.posthog.com · found in code
  • github.com · found in code
  • hooks.acme.com · found in code
  • mcp.sendmux.ai · found in remote endpoint, install command, code
  • sendmux.ai · found in code
  • smtp.sendmux.ai · found in code

Files it touches

  • Any path the agent passes to its tools

Tools (5)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • mailbox_get_attachmentGet Attachment Metadata

    Use this after finding a message attachment. It returns metadata plus a fresh short-lived download_url for that exact attachment; fetch the URL promptly, and call this tool again if it expires.

  • mailbox_read_attachmentRead Attachment

    Use this after finding a message attachment when you need the attachment contents. Text-like attachments are downloaded server-side and returned as text, so agents do not need a generic web_fetch tool. Binary or oversized attachments return metadata plus a fresh download link.

  • mailbox_upload_attachmentUpload Attachment

    Use this before sending a mailbox attachment. For real files set presign_upload_url=true with filename, content_type, and size_bytes, then PUT the file to the returned short-lived URL promptly and send the returned blob_id. Inline content_base64 is a last resort for tiny agent-authored files only and is capped at 32 KiB decoded.

  • mailbox_wait_for_messageWait For Message

    Use this to wait briefly for new mail instead of manual polling. It polls for up to 25 seconds, returns a matching message with attachment metadata when found, or a clean no_message result so you can call again.

  • sending_upload_attachmentUpload Attachment

    Use this before sending a Sending API attachment. For real files use sending_create_attachment_upload and PUT the file outside model context. Inline content_base64 is a last resort for tiny agent-authored files only and is capped at 32 KiB decoded.

Signals

Stars
62
Forks
1
Open issues
0
Contributors
2
Weekly downloads
74
Last commit (this folder)
Oct 13, 2026 (15 days ago)
Last release
Oct 2, 2026 (26 days ago)
Last package publish
Oct 2, 2026 (26 days ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Registry name
io.github.Sendmux/sendmux-mcp
Version
2.2.0
Auth
Auth not stated, API key
Packages
npm sendmux-mcppypi sendmux-mcp
License
MIT
Repository
github.com/Sendmux/sendmux-sdk
Website
sendmux.ai/docs/guides/mcp
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql
Cite this page

Email Inbox API + Sending by Sendmux MCP server. Agent Mart. https://agentmart.dev/connectors/sendmux-sendmux-mcp (last updated 2026-10-24)