The private gate has screened 980,216 outsider emails
Turn your email into a VIP channel. Only people in your contact list get through. Everyone else is silently screened out. 100% Signal. Zero Noise.
No card on the connection step. Review trial activation after Gmail or Outlook is linked.
Bank-grade security. Google Verified (CASA Tier 2). We never sell data. We never read emails.
Popular inbox workflows
The tasks executives run before turning on strict contact-based screening.
You wouldn't leave your office door wide open for strangers to walk in and demand your attention. Why do it with your Inbox? KeepKnown is the Executive Assistant that screens every visitor at the door.
Real-time monitoring keeps your inbox clean round-the-clock. Every email is instantly checked against your contacts.
Never miss newly added contacts. Everything syncs automatically from your email provider.
Manage VIP access lists and domain filtering for complete inbox control.
Contacts are hashed for matching and encrypted for debugging. Never stored as plaintext. We never sell or share your data.
Join thousands simplifying their inbox.
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emails filtered and counting
See how KeepKnown helps people reclaim their inbox.
"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."
Briefings, strategies, and operational updates for inbox security.
e mail synchronisation
Understand e mail synchronisation, from IMAP to Exchange. Learn 2026 best practices for Gmail & Outlook to reduce spam & protect focus.
Master Outlook inbox management with this step-by-step playbook. Learn to configure rules, use Focused Inbox, and implement allow-lists for security and focus.
how to block unwanted emails
Tired of spam? Learn how to block unwanted emails in Gmail & Outlook with filters, rules, and a deterministic allow-list strategy. Secure your inbox today.
Everything you need to know about privacy, security, and how KeepKnown works.
Still have questions? Contact our support team
Filter unknown senders automatically. Run a free Signal Audit first if you want proof before payment.
Signal Audit
A free Gmail unknown-sender report. No card, no email bodies read, and no inbox changes.
One public inbox protected by default
For one protected inbox.
Billed annually ($228/year, save $120)
Or save $120/year with yearly billing
Connect your inbox first. Add a card after connection; no charge today.
Multi-inbox control for executives and small teams
Built for up to three protected executive inboxes
For up to three protected inboxes.
Billed annually ($588/year, save $240)
Or save $240/year with yearly billing
Connect your inbox first. Add a card after connection; no charge today.
For executive teams and agencies
per month, billed annually
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