KeepKnown | The Inbox Control Layer for Gmail & Outlook

From filter to operating system

One inbox. Different rules for every kind of mail.

The private gate remains your default. Inbox Protocols add the judgment: who gets through, what gets routed, what deserves review, and when the rules should change.

Protocol Builder

Turn intent into a deterministic rule.

Draft in plain English or compose conditions manually. KeepKnown turns supported metadata into a protocol you can inspect before it ever acts.

Protocol intent

Route unknown first-time senders to Outsiders.

When Sender is first-time and Sender is unknown

Then Route to Outsiders

Saved paused for review

Private gate

Known people in. Unknowns screened.

Contacts, approved domains, and people you have replied to can pass. First-time unknown senders wait safely in Outsiders.

Curated library

Start with proven operating modes.

Install ready-made protocols for the work you are already doing, then tune them to your inbox.

↗ Fundraise Mode Investor, diligence, legal, payment Temporary

! Critical Unknowns Surface important first-time senders Safety

R Newsletters to Reading Later Keep list mail out of focus time Noise

Safe activation

See the effect before you hand over control.

Preview recent mail, observe in Shadow, send matches to Review Only, and enforce when the provider and protocol are ready.

Shadow Observe outcomes

Review only Approve decisions

Enforce Apply where supported

Decision Log

Nothing happens without a reason.

Every match records the protocol, the conditions that matched, and the action taken. Review, reverse, or pause from the decision itself.

Decision detail Matched

✓ Critical Unknowns Unknown sender + invoice subject category

Action Added to Priority Review

Control, in the right order

Connect. Preview. Then decide how far KeepKnown goes.

No black box and no leap of faith. KeepKnown shows you the system it is about to run, using your own inbox history, before anything moves.

Connect My Inbox

01

Connect Gmail or Outlook

Link an inbox without starting the clock. Your trial begins only when you choose to activate it.
02

Preview your real inbox

See how the starter protocols would classify recent mail and adjust the rules before activation.
03

Choose the operating mode

Observe in Shadow, approve in Review Only, or enforce supported actions when you are confident.

Privacy by capability, not by promise

Powerful rules. Without reading the room.

Core Inbox Protocols work from sender, domain, message headers, subject categories, local history, and your own decisions. Email bodies remain outside the core protocol engine.

Google OAuth verified CASA assessed Reversible actions

Protocol data boundary Core access

✓ Used to make decisions Sender · domain · headers · subject categories · history · your actions

— Outside core protocols Message body · attachment content · body-based AI classification

971,379+

outsider emails screened Every one moved out of the way without being deleted.

Attention should be governed. Not surrendered to whoever found your address.

Quietly working in the background

For people whose inbox is public infrastructure.

Less sorting. Fewer interruptions. Clear control over who and what gets through.

"KeepKnown has completely changed how we manage our inbox. We used to waste so much time sorting through junk mail — now it's clean, efficient, and stress-free. The spam control is spot-on, and we finally feel in control of our email again."

Taylor W.

Founder, NAPCO Pump Company

"I love KeepKnown, working quietly and diligently in the background, saving me hours of distraction. I don't know how anyone else manages their Inbox without it, or how this is not how everyone would want email to work. Bravo."

Paul N.

CEO, Intuitive

Inbox control for one founder or a full team

Every paid plan includes the private gate and Inbox Protocols. Run a free Signal Audit first if you want proof before payment.

971,379 outsider emails screened Google verified

Signal Audit

See your outsider volume before you pay.

A free Gmail unknown-sender report. No card, no email bodies read, and no inbox changes.

Run Free Audit Connect My Inbox

Founder

One public inbox, governed your way

$ 29 19 / month

For one protected inbox.

Billed annually ($228/year, save $120)

Or save $120/year with yearly billing

1 protected inbox
Gmail, Outlook & Microsoft 365
Private Gate and Inbox Protocols
Protocol library and temporary modes
Review Queue and Decision Log

Connect My Inbox

Connect your inbox first. Add a card after connection; no charge today.

Executive Pro

Multi-inbox control for executives and small teams

Built for up to three protected executive inboxes

$ 69 49 / month

For up to three protected inboxes.

Billed annually ($588/year, save $240)

Or save $240/year with yearly billing

Up to 3 protected inboxes
Gmail, Outlook & Microsoft 365
Private Gate and Inbox Protocols
Protocol previews and activation modes
Priority support
Review Queue, Decision Log, and analytics

Connect My Inbox

Connect your inbox first. Add a card after connection; no charge today.

Team Gate

For executive teams and agencies

From $199

per month, billed annually

5 protected inboxes included
Additional inboxes available
Central inbox management console
Protocol onboarding and rollout support
Priority escalation
Enterprise and agency options

Contact Sales

7-day free trial

Card after inbox connection

30-day money-back guarantee

Questions, answered plainly

You should understand the system governing your inbox.

KeepKnown is designed to be inspected, adjusted, and reversed—not blindly trusted.

Still curious? Talk to us

What is an Inbox Protocol?

An Inbox Protocol is a deterministic rule for how a kind of email should be treated. It can match sender, domain, headers, subject categories, local history, or your past decisions, then route the message to Inbox, Outsiders, Reading Later, a label, a digest, or Priority Review.

Does KeepKnown read email bodies?

Core Inbox Protocols do not read email bodies. They use sender and domain information, message headers, subject categories, local history, and your actions. Body-based keywords, attachment content, and body-based AI classification are outside the core protocol engine.

What happens to unknown senders?

The default private gate routes first-time unknown senders to Outsiders. They are not deleted. A protocol can also surface a critical unknown—such as a security, legal, invoice, contract, account, or payment message—in Priority Review.

Can I test protocols before they move mail?

Yes. New protocols save paused. You can preview them against recent mail, observe outcomes in Shadow, or place decisions in Review Only. Enforce is available only when the provider and protocol support the requested mailbox action.

Can I see why a message was moved or undo it?

Yes. The Decision Log shows the matching protocol, the facts that matched, and every resulting action. Supported mailbox moves are reversible, and you can pause the responsible protocol directly from its decision detail.

Which inboxes does KeepKnown support?

KeepKnown works with Gmail and Google Workspace, plus Outlook and Microsoft 365. Exact enforcement actions depend on the mailbox provider; Shadow and Review Only let you validate protocols before supported actions are applied.