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Email Inbox API + Sending by Sendmux

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

io.github.Sendmux/sendmux-mcp · Repository · Website · version 1.5.0 · 78 stars · listed from registry

Install

The sweep installs into a clean prefix, but this is the command a user would run:

uvx sendmux-mcp

Needs credentials: SENDMUX_MCP_SURFACES, SENDMUX_MAILBOX_API_KEY, SENDMUX_MANAGEMENT_API_KEY. The probe used placeholder values, so an amber needs credentials result below means the server asked for the real ones, not that it is broken. Maintainers: how to go green.

Results by platform

Linux

needs credentials2026-08-16 · probed over pypi

1 recorded run, oldest first.

handshake failed: MCP error -32000: Connection closed
--- stderr (tail) ---
Installed 76 packages in 95ms
Traceback (most recent call last):
  File "/home/runner/.cache/uv/archive-v0/P_ruCRBQo19Z129I/bin/sendmux-mcp", line 12, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/runner/.cache/uv/archive-v0/P_ruCRBQo19Z129I/lib/python3.13/site-packages/sendmux_mcp/cli.py", line 22, in main
    surfaces = surfaces_from_args(args)
  File "/home/runner/.cache/uv/archive-v0/P_ruCRBQo19Z129I/lib/python3.13/site-packages/sendmux_mcp/cli.py", line 84, in surfaces_from_args
    env_surfaces = parse_surfaces(os.environ.get("SENDMUX_MCP_SURFACES"))
  File "/home/runner/.cache/uv/archive-v0/P_ruCRBQo19Z129I/lib/python3.13/site-packages/sendmux_mcp/config.py", line 154, in parse_surfaces
    return normalise_surfaces(parse_csv(value))
  File "/home/runner/.cache/uv/archive-v0/P_ruCRBQo19Z129I/lib/python3.13/site-packages/sendmux_mcp/config.py", line 166, in normalise_surfaces
    raise ValueError("surfaces must contain only: mailbox, management, sending")
ValueError: surfaces must contain only: mailbox, management, sending

macOS

needs credentials2026-08-16 · probed over pypi

1 recorded run, oldest first.

handshake failed: MCP error -32000: Connection closed
--- stderr (tail) ---
Installed 74 packages in 431ms
Traceback (most recent call last):
  File "/Users/runner/.cache/uv/archive-v0/jSGTdV8QVxr-wY0u/bin/sendmux-mcp", line 12, in <module>
    sys.exit(main())
             ~~~~^^
  File "/Users/runner/.cache/uv/archive-v0/jSGTdV8QVxr-wY0u/lib/python3.14/site-packages/sendmux_mcp/cli.py", line 22, in main
    surfaces = surfaces_from_args(args)
  File "/Users/runner/.cache/uv/archive-v0/jSGTdV8QVxr-wY0u/lib/python3.14/site-packages/sendmux_mcp/cli.py", line 84, in surfaces_from_args
    env_surfaces = parse_surfaces(os.environ.get("SENDMUX_MCP_SURFACES"))
  File "/Users/runner/.cache/uv/archive-v0/jSGTdV8QVxr-wY0u/lib/python3.14/site-packages/sendmux_mcp/config.py", line 154, in parse_surfaces
    return normalise_surfaces(parse_csv(value))
  File "/Users/runner/.cache/uv/archive-v0/jSGTdV8QVxr-wY0u/lib/python3.14/site-packages/sendmux_mcp/config.py", line 166, in normalise_surfaces
    raise ValueError("surfaces must contain only: mailbox, management, sending")
ValueError: surfaces must contain only: mailbox, management, sending

Windows

needs credentials2026-08-16 · probed over pypi

1 recorded run, oldest first.

handshake failed: MCP error -32000: Connection closed
--- stderr (tail) ---
Installed 77 packages in 50.19s
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\runneradmin\AppData\Local\uv\cache\archive-v0\KJVRamLRt3hs-Pe6\Scripts\sendmux-mcp.exe\__main__.py", line 10, in <module>
  File "C:\Users\runneradmin\AppData\Local\uv\cache\archive-v0\KJVRamLRt3hs-Pe6\Lib\site-packages\sendmux_mcp\cli.py", line 22, in main
    surfaces = surfaces_from_args(args)
               ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\AppData\Local\uv\cache\archive-v0\KJVRamLRt3hs-Pe6\Lib\site-packages\sendmux_mcp\cli.py", line 84, in surfaces_from_args
    env_surfaces = parse_surfaces(os.environ.get("SENDMUX_MCP_SURFACES"))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\AppData\Local\uv\cache\archive-v0\KJVRamLRt3hs-Pe6\Lib\site-packages\sendmux_mcp\config.py", line 154, in parse_surfaces
    return normalise_surfaces(parse_csv(value))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\AppData\Local\uv\cache\archive-v0\KJVRamLRt3hs-Pe6\Lib\site-packages\sendmux_mcp\config.py", line 166, in normalise_surfaces
    raise ValueError("surfaces must contain only: mailbox, management, sending")
ValueError: surfaces must contain only: mailbox, management, sending

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