For individuals & teams · open source at v1
An AI email assistant.
An AI email assistant.
Your email, handled.
Spend less time sorting email and working out what to answer next. Mailtwine prioritizes incoming mail, prepares replies, tracks follow-ups, and routes team requests. Keep your email accounts and control what gets sent.
Open source at v1: AGPLv3 & supported self-hosting. Hosted during beta.
URGENT
customer@acme.com
Urgent: production outage
hello@northwind.io
Partnership inquiry
alex@strato.dev
Re: Integration question
maria@canvasapp.com
Billing issue
sam@peaklabs.co
Feature request
3
Review
4
Human-Do
5
Waiting
18
Done
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 →
Chrome extension
Mailtwine works inside your inbox.
Open any conversation in Gmail, Outlook, Fastmail, or Helpmonks. Mailtwine appears beside the thread with the context and suggestions you need to reply.
The extension is separate from direct mailbox sync. Native connections cover Google Workspace through Google OAuth or keyless service-account delegation, Microsoft through OAuth, Fastmail through JMAP, Helpmonks through its API, and standard IMAP with SMTP.
M
Gmail
O
Outlook
F
Fastmail
H
Helpmonks
- 01 Reply suggestions grounded in the open thread and your connected context.
- 02 Relevant emails surfaced beside the conversation before you search.
- 03 Thread briefings with a summary, intent, and suggested next step.
A better relationship with email
An unread count is not a work queue.
Mailtwine turns incoming messages into visible decisions, owners, and next actions.
1
Incoming
Requests, renewals, issues, approvals, and handoffs land in one queue.
2
Triage
Classify by urgency, customer, mailbox, owner, and rule.
3
Draft
Generate replies grounded in policies, history, and notes.
4
Route
Move each thread to the right teammate or queue.
5
Approve
Approve individual actions or authorize exact rules to handle routine work.
What an assistant should do
AI that waits for a prompt is not an assistant.
An AI email assistant should work before you ask. Mailtwine turns scattered messages into a prioritized queue — what needs review, who owns it, what can be drafted, and what can close.
Draft approvals
AI prepares the reply. Your team controls the final send.
Routing rules
Plain-language rules move email to the teammate who should own it.
Thread context
Each action keeps context attached, including source knowledge from Streamient.
Attention is expensive
An email assistant for your inbox and your team.
Go deeper
The email triage toolkit
How Mailtwine handles triage, prioritization, and the command-center way of working.
SOFTWARE
Email triage software
Classify, prioritize, summarize, route, draft, escalate — the full triage loop.
PRIORITIZEEmail prioritization tool
VIPs, deadlines, leads, and customer issues surface first.
CONCEPTEmail command center
What it is, and why triage is the engine behind it.
GUIDEHow to triage email
A practical AI triage system that actually sticks.
FREE DURING BETA
UNLIMITED ACCESS
Beta pricing
Every feature. No plan limits. $0.
Sign up today for unlimited access during beta and secure beta-user early-bird pricing for launch.
FAQ
Before you connect your inbox
Is Mailtwine open source? +
The complete application will be published under AGPLv3 when beta ends, with supported self-hosting. Use the hosted beta today. See the open-source roadmap for availability and what you will be able to run yourself.
Does it send without approval? +
Not by default. Mailtwine drafts and routes for review. An admin can approve an exact rule version for limited auto-send; changing that rule revokes its approval.
Does it replace my inbox? +
No. Keep the email accounts and inboxes you already use. Mailtwine changes how much work reaches you, not where your address lives.
Where does context come from? +
Mailtwine can use local mail context and stored knowledge from Streamient when connected.
Which email systems does Mailtwine support? +
Native connections include Google Workspace through tenant-owned Google OAuth or keyless service-account delegation; Outlook.com and Microsoft 365 through Microsoft OAuth; Fastmail through JMAP; Helpmonks through its native API; and standard IMAP with SMTP for sending. The Chrome extension separately works inside supported webmail.
Is Mailtwine an AI email assistant? +
Yes — one that works before you prompt it. Mailtwine prioritizes, summarizes, drafts, routes, follows up, and handles the exact routine actions you authorize.
Mailtwine · The bigger picture
One team.
One team.
Five tools.
Fewer gaps.
Mailtwine turns incoming email into a prioritized work queue—sorting, drafting, routing, following up, and handling approved routine work. Around it, four focused tools manage shared customer conversations, durable knowledge, digital assets, and product feedback.
01 · The shared inbox
Move from personal triage to team ownership.
Mailtwine surfaces what needs attention. Helpmonks gives support, sales, billing, and operations a shared place to assign customer conversations, collaborate on replies, and keep the full history together.
Meet Helpmonks
02 · The memory
Ground every draft in knowledge that lasts.
Streamient turns notes, decisions, URLs, stored email, and Git into shared, inspectable memory. When connected, Mailtwine can use that knowledge to prepare replies with the context your team already captured.
Meet Streamient
03 · The files
Put the right file behind every reply.
Razuna gives images, videos, and documents one governed, searchable home. Teams can find the approved asset an email needs without digging through shared drives or recycling an outdated attachment.
Meet Razuna
04 · The product loop
Turn inbox signals into product progress.
Feedback, objections, and feature requests often arrive by email. Managani brings them into one product-growth workspace with roadmaps, changelogs, chat, tours, surveys, highlights, and product tracking.
Meet Managani