Stop AI spam from flooding your inbox and calendar. Unknown senders solve a CAPTCHA or pay a fee to get in. Trusted contacts get through as usual.
7-day free trial · 5-minute setup · Archived, never deleted
Built for inboxes overwhelmed by AI outreach
Spam filters catch the obvious, but mass-customized outreach gets through. You miss what matters and drown in what you didn't ask for.
Step 01
Captchainbox scans your conversation metadata. We never read your messages. We build a trusted sender and domains list for you.
Sign in with your email providerStep 02
For every new email Captchainbox checks the sender against your trusted contacts. Unknown senders are archived (never deleted) and sent a verification link. Introductions through trusted contacts get through.
See how filtering worksStep 03
Unknown senders verify through a CAPTCHA or pay a small fee to show they are relevant to you. They complete the verification and their email is delivered to your inbox. Payment fees get pooled and donated.
See the verification flow in actionPricing
Free 7-day trial, no credit card required.
Set up in 5 minutes. Free to get started.
Curious what senders see? Send me an email and see the verification flow yourself.
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