# Make people pay to get into your inbox > Source: > Published: 2026-07-15 11:58:54+00:00 # Make unknown senders work to get into your inbox. 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. [See how it works](#how) 7-day free trial · 5-minute setup · Archived, never deleted Sarah Chen nowsarah@designco.com Re: new design direction Built for inboxes overwhelmed by AI outreach ## AI cold outreach is nearly free. Make senders work for your time and attention. 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 ### Sign in with your email provider. 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 provider](/auth/sign-in) Gmail connected you@gmail.com Analyzed 2,847 Trusted 284 Status Active Step 02 ### Every sender checked silently. 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 works](/auth/sign-in) Step 03 ### Senders show they are worth your time and attention. 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 action](mailto:felixdoerp@gmail.com?subject=Hey%20Felix%2C%20just%20testing%20Captchainbox&body=Hi%20Felix%2C%0A%0AI%20saw%20Captchainbox%20and%20wanted%20to%20see%20the%20verification%20flow%20in%20action.%0A%0ACheers) Inbox verification This inbox uses a quick CAPTCHA. Complete it to get your message delivered. Recipient picked: CAPTCHAComplete the CAPTCHA You're verified Your message is on its way to their inbox. Pricing ## Simple pricing to get back your time and attention. Free 7-day trial, no credit card required. Per inbox 7-day free trial included - Real-time inbox filtering - Calendar invite protection - Trusted circle from sent history - Introduction detection via CC - Configurable filter rules - Custom auto-reply templates - Emails archived, never deleted ## Take back your inbox. Set up in 5 minutes. Free to get started. Curious what senders see? [Send me an email](mailto:felixdoerp@gmail.com?subject=Hey%20Felix%2C%20just%20testing%20Captchainbox&body=Hi%20Felix%2C%0A%0AI%20saw%20Captchainbox%20and%20wanted%20to%20see%20the%20verification%20flow%20in%20action.%0A%0ACheers) and see the verification flow yourself.