@integratex/mailman

MailMan CLI — send and read Gmail just by asking your AI assistant, built for IndiaNIC infrastructure.

🌐 Live tour & docs: mailman.indianic.dev 📦 Public build: @integratex/mailman — npm i -g @integratex/mailman

See it in action

Ask your AI in plain English. MailMan drafts, previews, and only sends on your OK — never the moment you ask.

You:     mailman, send those docs to you@example.com
MailMan: Draft ready — To: you@example.com · Subject: "Docs"
         2 attachments · 1.4 MB. Send it?
You:     yes
MailMan: Sent.

Works the same in Claude Code · Cursor · Gemini CLI · Windsurf · Codex — email happens where you already work.

Screenshots and the full walkthrough → mailman.indianic.dev

Features

Send and read Gmail from your AI in plain English — "send those docs to Kalpesh," "show my last 10 emails"
Draft → preview → confirm safety — nothing sends until you approve (confirm_send won't dispatch without an explicit confirmation)
182 message templates + list_templates (FYI, follow-up, meeting, forward/reply and more — a subject prefix + a hint your AI composes from)
Personalised sends — draft_campaign turns one message into N, each addressed to one person by name, nobody seeing anyone else. Refuses to draft rather than send "Hi ,"; resumes a partial run instead of re-sending. ccFirstOnly/bccFirstOnly copy your manager once, not once per recipient
Signatures that render — plain text or HTML, your choice made by content. Table layout for a photo beside text, and the photo travels inside the message (Content-ID) so it shows without a "load images" prompt
Every HTML email carries a plain-text part — reply quoting, notification previews and screen readers get something readable, not a mangled auto-conversion
Attachments (files, folders, *.pdf globs), scheduled sends via an OS timer, inbox list / read / search, contacts + recipient suggestions
Multi-account, machine-bound encrypted credentials (OS keychain), desktop notifications on send
Session reports — search your past AI coding sessions by project or date, digest one or many, and email the summary. Tool output is dropped and secrets redacted before a word is composed
mailman doctor verifies your whole environment and every configured account; --fix prints the exact install command for anything missing, per platform
Installs into Claude Code, Cursor, Gemini CLI, Windsurf, Codex (mailman register) — cross-platform Win/Mac/Linux
29 MCP tools, exposed to your AI over MCP

Installation

Install globally from the public npm registry with npm or pnpm:

# npm
npm install -g @integratex/mailman

# pnpm
pnpm add -g @integratex/mailman

(No registry configuration needed — it's a regular public package on npmjs.com. mailman update later upgrades in place with whichever manager you used.)

If the install fails with `EEXIST: file already exists`

npm error code EEXIST
npm error path /opt/homebrew/bin/mailman
npm error File exists: /opt/homebrew/bin/mailman

Something else already owns the mailman command — usually an older install of this same tool under a different package name (@indianic/mailman, or the unscoped mcp-mailman it originally shipped as). npm never overwrites a command it didn't create, and it checks this before running any of the incoming package's scripts, so the package itself can't turn that into a friendlier message. Diagnose it with a one-off run, which needs no global install and so works while the install is still blocked:

npx -y @integratex/mailman doctor --offline

Its CLI command check names the package holding mailman and prints the fix. For the usual case, remove the old package first, then install:

npm uninstall -g @indianic/mailman     # whichever package the check named
npm install -g @integratex/mailman

Prefer that over npm install -g --force: force relinks successfully, but uninstalling the old package afterwards deletes the shared mailman command along with it and leaves you with none.

If the check reports a non-npm binary instead (GNU Mailman ships its own /usr/bin/mailman), keep both and use this tool's mcp-mailman alias.

If setup says `self-signed certificate in certificate chain`

Common on managed Windows machines. Setup shows the App Password being rejected, but the connection never got as far as logging in — Gmail never saw the password, and generating a new one will not help.

Corporate TLS inspection (Zscaler, Netskope, Palo Alto) and antivirus "scan encrypted connections" (Kaspersky, ESET, Avast, Bitdefender) terminate the connection and re-sign it with their own root CA. Windows trusts that root, so your browser is fine — but Node ships its own CA list and never reads the Windows store, so the handshake fails.

Let Node trust the Windows certificate store, then run the command again:

# PowerShell
$env:NODE_OPTIONS = "--use-system-ca"

# cmd.exe
set NODE_OPTIONS=--use-system-ca

# permanent (reopen the terminal afterwards)
setx NODE_OPTIONS "--use-system-ca"

macOS/Linux: export NODE_OPTIONS=--use-system-ca. The flag needs a Node built with it — mailman doctor says so explicitly if yours is too old, and upgrading Node is the simplest fix.

If it still fails, the root CA isn't in the OS store either. Export it (Windows: certmgr.msc → Trusted Root Certification Authorities → export as Base-64 .cer) and point Node at the file with NODE_EXTRA_CA_CERTS=C:\path\to\root.cer — or turn off HTTPS/SSL scanning in the antivirus for smtp.gmail.com:465 and imap.gmail.com:993.

mailman doctor diagnoses this directly: its SMTP/IMAP reachability checks complete a fully verified TLS handshake and name the root CA the chain actually ends at.

Usage

# First-run setup — adds a Gmail account (email + App Password) and
# registers your AI tools (Claude Code, Cursor, Gemini CLI, Windsurf, Codex)
mailman init

# Register with AI editors later
mailman register --tools claude,cursor
mailman register -i

# Diagnostics & current state
mailman doctor
mailman status

# Accounts, contacts, settings
mailman account add
mailman settings set defaultBodyType html
mailman settings set desktopNotifications false

# Scheduled sends
mailman scheduled list

# Self-update
mailman update

# Help & version
mailman help
mailman --version

Once installed and registered, you talk to your AI — not the CLI — for everyday email:

You: mailman, send those docs to you@example.com
AI:  [drafts subject/body, resolves attachments] Ready to send — confirm?
You: yes
AI:  Sent.

You: mailman, list my last 10 emails
You: search for invoices from last month
You: send this tomorrow at 9am instead of now   # goes out even if the tool is closed

Package vs. command names. The npm package is @integratex/mailman; it installs a CLI you run as mailman. A second alias, mcp-mailman, points at the same binary — use it only on a host that also has GNU Mailman's /usr/bin/mailman.

Sending to many people: broadcast or merge

Two shapes, and picking the wrong one is visible to the recipient.

Broadcast — draft_email with everyone in to/cc. One message, one reply thread, everyone can see it is a group email. Right for announcements and policy changes.

Personalised merge — draft_campaign → confirm_campaign. N separate messages, each addressed only to that person, their name rendered into the body. Right for outreach and individual nudges, where a shared envelope would leak the recipient list and read as bulk to spam filters.

"email the 12 people on this list about Thursday's demo, use their first names"

draft_campaign  →  preview: 12 recipients, ~1 min, 2 sample renderings,
                   plus every warning — who has no name on file, whether the
                   body says "Hi team" and should have been a broadcast
confirm_campaign → one approval sends all 12, paced at 20/min

What makes it safe to run unattended:

It refuses to draft if any recipient has an unresolvable {{placeholder}} — "Hi ," is worse than any group greeting, and draft time is the last moment it costs nothing to stop. Give a token a fallback with {{first_name|there}}.
Resume, never restart. A recipient is marked sent only after the transport returns a message id, so a crash or a retry continues where it stopped rather than emailing everyone twice.
ccFirstOnly / bccFirstOnly attach to the first message that actually sends, so a manager sees the campaign went out once — not once per recipient.
It aborts at ~25% failures instead of grinding through a list with bad credentials.

Full design notes: docs/CAMPAIGNS.md.

How it works

A native stdio MCP server: your editor launches it via npx -y @integratex/mailman and Claude calls its tools from natural language. It reaches Gmail two ways — SMTP/IMAP for App Password accounts, or the Gmail REST API for OAuth2 accounts. Pure Node.js, so behavior is identical on macOS, Linux, and Windows. Configured once, globally — available from any project.

Manual MCP config (what init/register write for you — note it carries no secrets, credentials live in the OS keychain):

{
  "mcpServers": {
    "mailman": { "command": "npx", "args": ["-y", "@integratex/mailman"] }
  }
}

Claude Code — claude mcp add mailman -- npx -y @integratex/mailman
Cursor / Windsurf / Gemini CLI / Codex — add the block to that tool's MCP config file.

Docs

docs/FEATURES.md — plain-English + technical feature tour
docs/PLAN.md — architecture: auth, storage, tools, flows
docs/SKILLS.md — the MCP tools this server exposes
docs/CLI.md — every terminal command (setup, accounts, diagnostics)
docs/CAMPAIGNS.md — personalised sends: design, guarantees, what shipped
docs/CROSS-OS.md — per-OS support matrix

OAuth2 / browser sign-in (the passwordless path)

Regular Gmail passwords cannot be used with mailman — Google disabled password login for SMTP/IMAP in 2022, so only an App Password or OAuth2 is accepted. mailman init / account add open with a choice: App Password (paste a 16-char code — the default, simplest path) or Sign in with browser (OAuth2) — no password, and the option to use if you're passkey/passwordless or your Workspace admin disabled App Passwords. mailman auth login <alias> is the same OAuth2 flow as a standalone command.

Passkeys can't be handed to SMTP/IMAP directly, but they work inside the browser sign-in: when OAuth2 opens Google's consent page, authenticate there with your passkey — mailman stores the resulting refresh token, not the passkey.

OAuth2 uses your own Google Cloud OAuth client — a one-time setup that replaces per-account passwords. A browser opens for consent and the refresh token is stored encrypted. On a headless box, it prints the consent URL + an ssh -L tunnel command instead of launching a browser.

Creating the OAuth client (one-time, ~2 min)

Google Cloud Console → create/select a project → APIs & Services → Library → enable the Gmail API (and People API if you want contact suggestions).
APIs & Services → OAuth consent screen → External → add yourself as a Test user (so you don't need Google app verification). Publishing status can stay "Testing".
APIs & Services → Credentials → Create credentials → OAuth client ID → Application type: Desktop app. ⚠️ This must be Desktop app, not Web application.
Copy the Client ID and Client secret — paste them when auth login / account add asks.

Error 400: redirect_uri_mismatch? Your client is a Web application type. mailman signs in over a loopback redirect (http://127.0.0.1:<random-port>), which only Desktop-app clients allow — Web-app clients require every redirect URI to be pre-registered with a fixed port, so a random port always fails. Delete the client and create a Desktop app one instead. There is nothing to configure on mailman's side.

Scopes requested: gmail.send, gmail.readonly, contacts.readonly. (gmail.readonly is read access to your whole mailbox — App Password accounts get equivalent read access implicitly via IMAP.)

Security

Credentials are encrypted at rest with AES-256-GCM, and the key is never in the config dir. Copying accounts.json to another machine yields useless ciphertext — mailman there refuses to decrypt rather than degrade. mailman never falls back to storing secrets in plaintext. Every tool call is appended to a local activity.log (tool name + non-sensitive metadata only — never bodies/credentials).

Where the key itself lives is a keystore backend. On a desktop you never choose one — the OS credential store is the default and nothing changes:

Keystore	Where the key is	Protects against	Does not protect against
`os-keychain` (default)	macOS Keychain, Windows Credential Manager, Linux Secret Service	the config dir being copied anywhere; the key is bound to this machine and user	anything running as you on this machine while the keyring is unlocked
`passphrase`	nowhere — derived with scrypt from a passphrase you type. Only a salt is stored	the config dir being copied and read; no key material exists at rest	someone who has both the config dir and the passphrase — unlike `os-keychain`, this is not machine-bound
`env`	nowhere — handed to the process in `MAILMAN_MASTER_KEY`	whatever your platform's secret store protects; mailman persists nothing	anything that can read the process environment
`file`	a 0600 file outside the config dir	the config dir being copied with the key left behind (rsync, `docker COPY`, a stray commit)	anything running as you that can read the file. `doctor` reports this backend as degraded

mailman doctor prints which one is active. To change it, move the key deliberately — never by just switching the setting:

mailman auth migrate-keystore --to passphrase   # re-encrypts, or moves the key, as appropriate

Headless Linux, Docker, CI

The OS credential store needs a running Secret Service daemon, not just the libsecret library — and a headless server has no desktop session to unlock one. Making gnome-keyring work there takes ~16 extra packages (gcr4 pulls in GTK4), a gnome-keyring-daemon --unlock systemd user service fed a password file, and loginctl enable-linger. Don't. Pick a keystore that needs no session:

# A person is present at setup, and unattended runs read the passphrase from the environment
MAILMAN_KEYSTORE=passphrase mailman init

# Containers, CI, systemd — your platform already manages secrets, so let it
export MAILMAN_MASTER_KEY="$(node -e 'console.log(require("crypto").randomBytes(32).toString("base64"))')"
MAILMAN_KEYSTORE=env mailman init

This also makes Alpine/musl work, which it previously didn't: keytar installs there but its binary can't load without libsecret, and nothing else needs it. Verified on node:20-alpine — nothing to install, just pick a keystore.

Be clear-eyed about the trade: on a headless box an auto-unlocked gnome-keyring is roughly equivalent to a root-owned key file, with far more moving parts. passphrase is stronger than either only while the passphrase is not sitting next to the ciphertext — which means a MAILMAN_MASTER_PASSPHRASE line in a crontab is a key file with extra steps, and a worse one, since a passphrase is likelier to be reused elsewhere than 32 random bytes are. For unattended sends prefer env (platform-managed) or accept file knowingly.

Scheduled sends on Linux run from crontab, which has no D-Bus session. mailman writes DBUS_SESSION_BUS_ADDRESS, XDG_RUNTIME_DIR, MCP_MAILMAN_CONFIG_DIR and MAILMAN_KEYSTORE into the line it manages, and repairs an older line the next time you schedule something. It will not write your passphrase or key there — that is your call to make. On a server, also run loginctl enable-linger $USER, or /run/user/$UID disappears at logout and takes the session bus with it.

Env var	Purpose
`MAILMAN_KEYSTORE`	`os-keychain` \| `passphrase` \| `env` \| `file`. Overrides the recorded backend — unset it after migrating, or it keeps winning
`MAILMAN_MASTER_PASSPHRASE`	passphrase for the `passphrase` keystore, for unattended runs
`MAILMAN_MASTER_KEY`	base64 32-byte key for the `env` keystore
`MAILMAN_MASTER_KEY_FILE`	overrides where the `file` keystore keeps its key

See docs/HEADLESS-KEYSTORE.md for the design and docs/CROSS-OS.md for the per-OS matrix.

Config location

All state (accounts, contacts/recents, settings) lives in one global, per-OS-user directory — never inside a project:

OS	Path
macOS	`~/Library/Application Support/mcp-mailman/`
Linux	`~/.config/mcp-mailman/`
Windows	`%APPDATA%\mcp-mailman\`

Desktop notifications

After each successful send (interactive and scheduled), mailman fires a native desktop notification — macOS Notification Center (osascript), Linux notify-send, Windows toast. On by default; best-effort (never blocks/fails a send). Toggle:

mailman settings set desktopNotifications false
mailman settings set desktopNotifications true

Staying up to date

Interactive mailman commands show a one-line "update available" notice when a newer version is published (cached daily). Upgrade in place — it uses the package manager that installed it (npm or pnpm):

mailman update    # or: mailman upgrade

Restart your AI tools afterward so their MCP server picks up the new version.

Contributing

Issues and pull requests are welcome — you don't need commit access, the standard fork → branch → PR flow works. See CONTRIBUTING.md for local setup, the development loop (lint / typecheck / test — exactly what CI runs), where things live, and which changes won't be merged and why.

🐞 Report a bug — include your mailman doctor output
💡 Request a feature
💬 Ask or discuss
🔐 Security issues: email hello@indianic.com — not a public issue

License

MIT

Name		Name	Last commit message	Last commit date
Latest commit History 240 Commits
.github		.github
bin		bin
docs		docs
src		src
test		test
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
eslint.config.js		eslint.config.js
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json

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@integratex/mailman

See it in action

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If the install fails with `EEXIST: file already exists`

If setup says `self-signed certificate in certificate chain`

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Sending to many people: broadcast or merge

How it works

Docs

OAuth2 / browser sign-in (the passwordless path)

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@integratex/mailman

See it in action

Features

Installation

If the install fails with EEXIST: file already exists

If setup says self-signed certificate in certificate chain

Usage

Sending to many people: broadcast or merge

How it works

Docs

OAuth2 / browser sign-in (the passwordless path)

Creating the OAuth client (one-time, ~2 min)

Security

Headless Linux, Docker, CI

Config location

Desktop notifications

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If the install fails with `EEXIST: file already exists`

If setup says `self-signed certificate in certificate chain`