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Create my first rule
Illustrative classroom. Your inbox. Your rules. Describe, Preview, Approve.
Inbox Academy Illustrative lesson

Tell your inbox
what to do.

Create inbox rules in plain English.
Preview them. Choose when they run.

Create my first rule See how it works

No card to draft or preview. Connect an inbox for a real preview.

Google & Microsoft inboxes

Welcome. Tell your inbox what to do.

From plain English to powerful rules

A sentence.
A rule you can check.

Start with the outcome you want. KeepKnown turns supported requests into rules you can inspect.

Keep a company’s email together

Label messages from northstar.example as Clients.

Match a sender or domain. Apply a Gmail label or Microsoft category.

Rule you can check

Domain matches
northstar.example
Action
Apply label/category: Clients

Leave room for an exception

Except billing@northstar.example.

Exclude a specific sender while keeping the company rule easy to review.

Rule you can check

Domain matches
northstar.example
Exclude sender
billing@northstar.example
Action
Apply label/category: Clients

Catch either subject phrase

Label messages whose subject contains ‘proposal’ or ‘estimate’ as Quotes.

Match alternative subject phrases in one rule. No body analysis required.

Rule you can check

Subject contains
proposal OR estimate
Action
Apply label/category: Quotes
Prefer a starting point? Unfamiliar-sender screening uses your contacts and allowlist to identify outsiders.

Make every rule your own.

Fine-tune who matches, add an exception, or combine subject phrases. Review each detail before your rule runs.

Keep a company’s email together

“Label messages from northstar.example as Clients.”
Rule you can check
Domain matchesnorthstar.example
ActionApply label/category · Clients

Match a sender or domain. Apply a Gmail label or Microsoft category.

Leave room for an exception

“Except billing@northstar.example.”
Rule you can check
Domain matchesnorthstar.example
Exclude senderbilling@northstar.example
ActionApply label/category · Clients

Exclude a specific sender while keeping the company rule easy to review.

Catch either subject phrase

“Label messages whose subject contains ‘proposal’ or ‘estimate’ as Quotes.”
Rule you can check
Subject containsproposal OR estimate
ActionApply label/category · Quotes

Match alternative subject phrases in one rule. No body analysis required.

Prefer a starting point? Unfamiliar-sender screening uses your contacts and allowlist to identify outsiders. Find them under KK:OUTSIDERS: a Gmail label or Microsoft category. Archiving or moving depends on your settings.

You stay in the loop.

From the first instruction to the first action, there is something concrete to review.

  1. 1

    Connect your
    supported inbox

    Create an account, then approve Google or Microsoft mailbox permissions. Signing in and connecting email are separate steps.

    Example · connection choicesConnect your inbox

    Choose your email provider to get started.

    Google Microsoft
    Your existing inbox. A new set of possibilities.
  2. 2

    Describe and
    inspect your rule

    Read the conditions, exceptions, and actions. Unsupported requests are surfaced; unclear instructions may need a clarification or edit.

    Example · draft, not running
    Label Northstar mail as Clients, except their billing address.
    Rule you can check
    Domain matchesnorthstar.example
    Exclude senderbilling@northstar.example
    ActionApply label · Clients
  3. 3

    Preview, activate,
    see what happened

    Preview a sample, choose access if needed, and approve activation. Check your activity history for the actions that actually ran. Other active rules may also affect a message.

    Example · review before activation
    PreviewActivity
    Northstar project updateMatches
    Northstar billingExcluded
    You choose when it starts.

Drafts and previews don’t change mail. New rules apply to messages after activation—not to older mail or the preview sample. Resuming a paused inbox requires separate approval and establishes a new processing boundary. Checkout alone never activates a rule.

Know what you’re
giving access to.

Rules work on supported email handling. You choose the actions—not an AI acting without your approval.

Read the privacy details

Your instruction goes to AI

OpenAI receives your rule-building instruction, clarification answers and the supported rule-building context. We do not send mailbox samples, email bodies, attachments or credentials to the rule builder. Avoid pasting private message content into your instruction.

Your mailbox supplies the matching data

The filtering engine uses metadata such as sender, subject and labels or categories. Previews display a limited sample of stored metadata. Connection permissions are broader: Google and Microsoft request access to read and change mail, with contacts and label/category permissions for supported features.

You can pause and reconnect

Pause a rule or inbox to stop new processing. Work already in progress may finish. If authorization stops working, the inbox needs attention; reconnect the affected account and explicitly approve resuming it.

Recovery depends on the provider

Gmail offers restore and supported undo actions where the original message and action state allow it. Microsoft does not offer Gmail’s restore controls or general undo. You can inspect categories and folders in Outlook. Pausing does not reverse previous actions.

Preview first.
Automate when ready.

Connect an inbox to draft and preview with no card. Choose paid access when you’re ready to automate.

Founder

1 inbox

$12.99USD / month

Or $99.99 USD / year, billed annually.

  • Plain-English rule creation and manual editing
  • Preview matches before activation
  • Supported Gmail and Microsoft actions
  • Rule controls and activity history
Create my first rule Start with annual billing

Executive Pro

3 inboxes

$29.99USD / month

Or $229.99 USD / year, billed annually.

  • Plain-English rule creation and manual editing
  • Preview matches before activation
  • Supported Gmail and Microsoft actions
  • Rule controls and activity history
Create my first rule Start with annual billing

7-day automation trial for eligible new users. A card is required to start the trial, after you preview. Your selected plan is charged automatically when the trial ends unless you cancel before then. Choosing access does not activate your rule.

Both plans offer the same rule-building capabilities; the inbox allowance differs. Existing subscriptions and lifetime access keep their current billing terms. Need more inboxes? Contact us.

Before your first rule.

A few things worth knowing before you connect.

Which inboxes can I connect?

Gmail and Google Workspace; personal Outlook.com and Microsoft 365 work/school accounts with an Exchange Online primary mailbox. Organization policies may require admin consent. Shared mailboxes, on-premises Exchange and archive mailboxes are not supported.

What is free, and when do I need a card?

After connecting, you can draft and preview without a card. Automation needs active access. Eligible new users can choose the trial shown in pricing; a card is required at trial checkout. Existing paid customers use their current access.

Does a preview change my email?

No. It evaluates the rule against up to 100 locally stored message snapshots and shows up to 10 examples. It is a sample, not a complete inbox scan or a simulation of every other rule. Editing the rule requires a fresh preview before activation.

Will it run on older messages?

New automation starts prospectively at activation. It does not replay existing mail or the preview sample. If your inbox is paused, resume it separately; that establishes a new boundary for processing.

Where does processed mail go?

That depends on the actions you approve. Labels in Gmail and categories in Microsoft organize messages without being folders. Archiving or moving changes location. The unfamiliar-sender starter uses KK:OUTSIDERS, with archiving or moving determined by your settings. Check your activity history and the connected mailbox.

Can I ask it to do anything?

No. KeepKnown creates rules for supported email conditions and actions. It surfaces unsupported or ambiguous requests. It does not extract attachments, analyze message bodies, forward messages, schedule external tasks, or run Telegram and webhook workflows.

Can I pause or undo a rule?

You can pause new processing; work already underway may finish. Pausing does not undo past changes. Gmail recovery is limited to supported actions and available message state. Microsoft has no general undo or Gmail restore controls. See the control and recovery details.

Is this the same product as EmailGuru?

Yes. EmailGuru became KeepKnown. Unfamiliar-sender screening remains a starter option alongside rules you describe, preview and approve. Read about the name change.

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Your next rule starts
with a sentence.

Connect your inbox. Draft and preview with no card.
Choose paid access when you’re ready to automate.

Create my first rule Tell your inbox what to do.