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npubmail MCP server

by npubmail.com·com.npubmail/npubmail·v0.2.1
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Email inbox for AI agents, owned by a Nostr key. No signup or API key. Receive codes, read, send.

A85/100grade A
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Safety scan
A85/100

full report

Adoption
New

0 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

npubmail tools

No tool declarations could be read from the package source. They show once the server is installed.

Public scan report

scanner v0.1.10 · 2026-10-09 · same rubric, same numbers if you re-run it

no findings
  • –Code scanpackage could not be scannedn/a
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 1 days ago15/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace7/10
Overall 85/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How npubmail compares

Against every graded Email MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
85/100
higher than 78% of 916 Email servers

Install npubmail in Claude Code, Cursor or VS Code

The registry entry has no remote endpoint or installable package.

What the publisher says

From the npubmail repository's README, as published. We do not edit it. Read it on GitHub

npubmail clients

Email for AI agents, owned by a Nostr key. No signup, no password, no API key: the agent's keypair is the account.

This repository holds the open clients for the hosted service at npubmail.com:

  • cmd/npubmail: command-line client
  • cmd/npubmail-mcp: MCP server (Claude Code, Hermes, OpenClaw, any MCP client)
  • client/: Go library (EnsureMailbox, CreateAlias, WaitFor, Send, ...)
  • skills/npubmail/SKILL.md: agent skill
  • docs/: HTTP API, the sealed-mail format (SEAL.md) with test vectors, and Python/JS examples

Install

One click (Claude Desktop and other MCPB clients): download npubmail-mcp-0.2.1.mcpb and open it.

Listed in the official MCP Registry as com.npubmail/npubmail. <!-- mcp-name: com.npubmail/npubmail -->

curl -fsSL https://npubmail.com/install | sh       # prebuilt, checksummed binaries
# or from source:
go install github.com/obvioussummer46/npubmail/cmd/npubmail-mcp@latest
go install github.com/obvioussummer46/npubmail/cmd/npubmail@latest

MCP config:

mcp_servers:
  npubmail:
    command: npubmail-mcp          # talks to https://npubmail.com
    timeout: 660                   # wait_for_* can block up to 600 s

Use it

npubmail init myagent                      # -> myagent@npubmail.com (key at ~/.config/npubmail/nsec)
npubmail alias --from github.com --ttl 24  # disposable, sender-locked address
npubmail code --timeout 120                # block until mail arrives, print the OTP

Agents: start at https://npubmail.com/llms.txt.

What the service does

  • Receive: free. Disposable aliases per signup, codes and links extracted.
  • Encrypted at rest: each message is sealed to the owner's Nostr key (see docs/SEAL.md); the server cannot read stored mail.
  • Send: replies to people who wrote to you are free, and so is mail to other npubmail mailboxes. Mailing a new recipient costs a few sats over Lightning, per message, with no account balance.
  • Inbound TLS (STARTTLS), DKIM/SPF/DMARC on outbound.

Your key is your account

~/.config/npubmail/nsec is the only credential. Back it up; there is no reset. The clients sign every request locally (NIP-98) and never send the key anywhere.

Licence

MIT (LICENSE): clients, library, protocol packages, skill and examples. The server is not in this repository.

Nothing above is checked by us. What we check is on the safety report.

npubmail: common questions

Is npubmail MCP server safe?
Yes, by our scan: it is graded A (85/100). Read the npubmail safety report
Does npubmail need an API key?
No secret keys are declared. It reads 1 setting from the environment.
Is npubmail maintained?
The last commit was 27 days ago (2026-10-08). The latest release is v0.2.1.
What can I use instead of npubmail?
Servers from other publishers that do the same job: Agenticmail MCP server, Sendraven MCP server and Tmailor temporary email MCP server.

Alternatives to npubmail

Same job from other publishers: the closest match first, then the best rated.

  • Agenticmail
    Real email and SMS for AI agents — send mail, receive verification codes, drive a real inbox.
    B
  • Sendraven
    Email infrastructure for AI agents: send, read replies as threads, campaigns, per-key limits.
    B
  • Tmailor temporary email
    Receive-only temporary email addresses for AI agents: create an inbox, wait for an email, read it.
    B
  • Bird
    Send and receive across email, SMS, WhatsApp, and voice. One API, one contract.
    A
  • MX Probe
    Email verification for AI agents: send, hold or kill with the reason. Signup and credits by API.
    B