The email underdog · built to act

Sort your inbox.
Draft replies. Follow up.

Mailtwine starts before you ask: sorting, drafting, routing, following up, and handling the routine actions you authorize. AI email triage is the machinery underneath, not the job waiting for you.

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// ARRIVAL → TRIAGE → DRAFT → ROUTE → APPROVE → DONE

Pencil portrait of Nitai, founder of Mailtwine
Why I built Mailtwine

I got tired of waiting for the inbox to grow up.

Hey, I’m Nitai. I built Helpmonks and have spent years helping teams manage customer, support, sales, and founder email.

Every big inbox shipped another filter, another tab, another AI button. The bargain never changed. You were still expected to read, sort, remember, and reply to everything.

I did not build Mailtwine to give you another inbox to babysit. I built it to do the work the old inboxes still hand back to you.

Keep the accounts you already use. Mailtwine works behind them, handles the routine work, and brings you only the decisions that still need you.

NitaiFounder of Mailtwine and Helpmonks

Works with your existing email

Keep your mailbox. Get help with the work.

Mailtwine is the underdog working behind the accounts you already use. No new address. No migration. No swapping one inbox for another. It sorts, drafts, routes, and follows up in the background, then asks for attention only when a decision still needs you.

Connect Google Workspace through tenant-owned Google OAuth or keyless service-account domain-wide delegation, Outlook.com and Microsoft 365 through Microsoft OAuth, Fastmail through JMAP, Helpmonks through its native API, or any standard IMAP mailbox with SMTP for sending. MCP-compatible clients connect over OAuth for mail search, summaries, draft suggestions, routing, and approval review.

Google OAuth Keyless service accounts Microsoft OAuth Fastmail JMAP Helpmonks IMAP + SMTP MCP clients

AI assistant for Gmail & Workspace → AI assistant for Outlook →

01 · Triage

Automatically sort and prioritize email.

Zero-lag labeling, category sorting, and smart prioritization the moment mail lands — with SLA and urgency flags where they matter. The Triage Digest summarizes every thread so you read the situation, not the scrollback. New to the method? Start with how to triage email with AI.

Zero-lag labels SLA flags Urgency stickers Triage Digest
SORTED IN 0.4S
triage queue
customer@acme.com
Checkout failing since 09:12
P1 · SLA 1h
hello@northwind.io
Partnership inquiry
Sales
maria@canvasapp.com
Refund on annual plan
Billing
Triage digest

Acme's checkout is down and the tone is escalating — the ask is a fix ETA. Two other threads can close today.

02 · Draft

AI reply drafts you can review before sending.

Mailtwine writes highly specific draft replies grounded in your historical email style, your policies, and the full thread context. Drafts wait for review unless an admin has approved the exact auto-send rule version.

Your voice Policy-grounded Thread context Review-first Version-bound auto-send
SOUNDS LIKE YOU
mailtwine — draft reply
Mailtwine reply composer with recipient, subject, follow-up nudge, Help me write, draft, and send controls
03 · Route

Automate email routing with plain-language rules.

Routing rules move mail to the teammate who should own it — no syntax, no flowchart builder. Chain multi-step proactive automations, and let bi-directional webhooks hook into Helpmonks or your internal systems.

Plain-language rules Multi-step automations Bi-directional webhooks
NO SYNTAX
mailtwine — AI rules
Mailtwine AI Rules settings with ordered email handling, history, apply, edit, and add rule controls
04 · Approve

You set the authority.

Mailtwine starts review-first. Approve one action or authorize one exact rule version to handle routine work. Material rule changes revoke that authority, and every thread keeps a full audit trail.

Message review Review-first default Exact-rule authority Full audit trail
YOU HOLD THE PEN
mailtwine — message review
Mailtwine message review with thread history, summary, internal notes, reply options, and mailbox actions
Engines

Fast engines included. No key setup.

Out of the box, Mailtwine runs on lightning-fast, highly capable mini models — no API keys, no configuration, no setup screen at all.

INCLUDED

Mini engines

Lightning-fast mini models handle triage, labels, and digests on every plan. Sign up, connect mail, go.

PRO TIER

Heavy-context engines

Heavier context models power deep-context drafting and automations — for long threads and high-stakes replies.

Integrations

Bring the mailbox you already have.

No migration, no new address. Mailtwine connects directly to Google Workspace, Microsoft, Fastmail, Helpmonks, and standard IMAP mailboxes. The Chrome extension works inside supported webmail, while MCP-compatible clients provide another way to search, triage, summarize, draft, route, and review email.

NATIVE · OAUTH

Google Workspace

Connect through tenant-owned Google OAuth or keyless service-account domain-wide delegation — without JSON key files.

NATIVE · JMAP

Fastmail

JMAP keeps messages, drafts, replies, and mailbox actions in step with Fastmail.

NATIVE · API

Helpmonks

The native Helpmonks API keeps shared-inbox drafts, replies, and workflow actions connected.

STANDARD PROTOCOLS

IMAP + SMTP

Connect any standard IMAP mailbox directly and configure SMTP for native sending.

NATIVE · OAUTH

Microsoft 365

Outlook.com and Microsoft 365 connect through Microsoft OAuth and Microsoft Graph.

REMOTE · OAUTH

MCP clients

Use an MCP-compatible client for mail search, triage, summaries, draft suggestions, routing, and approval review.

Mailtwine in your terminal

Mailtwine, now from your terminal.

One package. Two ways to work. Automate triage workflows with scripts and coding agents, or work your email queue directly without leaving the terminal.

CLI · Scripts & agents

Automate the work before the reply

Search mail, prioritize threads, run triage, draft replies, and trigger rule actions from scripts, CI jobs, or coding agents through the complete Mailtwine MCP catalog.

  • Structured JSON and readable table output
  • Environment credentials and multi-account routing
  • Explicit confirmation for destructive actions
mailtwine-cli 
$ pnpm add --global \
    @mailtwine/cli
$ mailtwine-cli \
    triage queue \
    --table
TUI · Interactive client

Work your email queue from the terminal

Fast, keyboard-first email triage and composing right in your terminal. Browse Act, Drafts, Catch up, and Promotions, read threads, compose in Markdown, and take action with realtime sync.

  • Browser OAuth with secure local keyring
  • Keyboard-first triage, search, and navigation
  • Markdown composer with drafts, AI, and attachments
mailtwine-tui 
$ mailtwine-tui

MAILTWINE  Act  Drafts  Catch up
Later  Waiting  Archived  Spam
Connected · 3 items require action
▸ Urgent: Checkout broken — Acme
Install from npm Read the MCP guide

Requires Node.js 24 or newer. The TUI supports macOS and Linux and signs in through browser OAuth.

Ecosystem

Plays well with the family

Built by the people behind Helpmonks, Razuna, and Streamient — Mailtwine ships knowing its siblings. MCP server and API available, too.

PUSH

Helpmonks

Push clean drafts and action notes straight into your shared inbox.

PULL

Streamient

Pull stored knowledge for grounded, factual replies with sources attached.

FAMILY

One team

Same builders as Helpmonks, Razuna, and Streamient. Same long paper trail.

AGPL AT V1
Open source at v1

Free to start. Public at v1.

Mailtwine is hosted and free to start during beta; when we hit v1, the code goes public (AGPL) and you can run it yourself, close to your own stack. No upgrade maze — pricing is never about withholding the useful parts.

HOSTED & FREE IN BETA AGPL AT V1 RUN IT YOURSELF NO UPGRADE MAZE
FREE TO START TEAMS WELCOME Ready when you are

Start with a calmer inbox

Every feature above, on one visible path. Free gets you moving today.

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