KeepKnown

What it does

KeepKnown is an advanced filter builder for Gmail and Outlook. Combine relationship, history, header, attachment, subject, and mailbox signals with nested logic; preview rules on real mail; activate in Shadow, Review Only, or Enforce where supported; and trace every match in a decision log. New filters save paused, reusable templates speed up common workflows, and core filtering does not read email bodies.

Build advanced Gmail and Outlook filters with richer conditions, safe previews, staged activation, and a decision log for every match.

Create richer rules, test them on real mail, and see why every message moved. Works with Gmail and Outlook. KeepKnown gives filters a builder, a test bench, and a decision log. Combine sender, contact, domain, subject, header, history, and mailbox signals with nested all, any, and exception logic. Filter by contacts, approved domains, people you replied to, VIPs, and your own sender groups. Keep, move, label, prioritize, hold for review, or add matching mail to a digest. Start with a useful rule, see exactly what it does, then make it yours. Contacts, approved domains, and prior replies stay in your inbox. A previous rescue triggers a sender or domain approval suggestion. KeepKnown helps…from keepknown.com

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