Make people pay to get into your inbox

Captchainbox, a new email filtering service, requires unknown senders to solve a CAPTCHA or pay a fee to reach a user's inbox, aiming to combat AI-generated spam. The service scans email metadata to build a trusted sender list and archives unknown messages without deletion. It offers a 7-day free trial and positions itself as a solution for inboxes overwhelmed by AI outreach.

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.