--- title: Make senders work to get into your inbox | daily.dev description: Captchainbox is a service that protects email inboxes from AI-generated cold outreach and spam by requiring unknown senders to either solve a CAPTCHA or pay a... canonical: https://daily.dev/posts/make-senders-work-to-get-into-your-inbox-ycj9jq1um twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Make senders work to get into your inbox | daily.dev og:description: Captchainbox is a service that protects email inboxes from AI-generated cold outreach and spam by requiring unknown senders to either solve a CAPTCHA or pay a... og:url: https://daily.dev/posts/make-senders-work-to-get-into-your-inbox-ycj9jq1um og:image: https://api.daily.dev/og/posts/YCj9JQ1Um.png og:image:alt: Make senders work to get into your inbox og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Make senders work to get into your inbox **[Hacker News](https://daily.dev/sources/hn)** · 2 min read · 0 upvotes · 0 comments ## Summary Captchainbox is a service that protects email inboxes from AI-generated cold outreach and spam by requiring unknown senders to either solve a CAPTCHA or pay a small fee before their message is delivered. It connects to your email provider, builds a trusted contacts list from your sent history, and silently archives emails from unverified senders without deleting them. Trusted contacts pass through unaffected, and introductions via CC'd trusted contacts are also recognized. It includes calendar invite protection, configurable filter rules, and custom auto-reply templates. Pricing is a one-time payment with a 7-day free trial. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Your sign-up form is a weapon](https://daily.dev/posts/your-sign-up-form-is-a-weapon-cwnsa8fnc) · Hacker News · 0 upvotes · 0 comments - [The Send Button Safety Net: IRONSCALES Email Encryption](https://daily.dev/posts/the-send-button-safety-net-ironscales-email-encryption-sup3ir6zl) · Security Boulevard · 0 upvotes · 0 comments - [My friend’s email startup finally got traction. Turns out it was a phisher.](https://daily.dev/posts/my-friend-s-email-startup-finally-got-traction-turns-out-it-was-a-phisher--t4kizq9px) · Medium · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security) [View this post on daily.dev](https://daily.dev/posts/make-senders-work-to-get-into-your-inbox-ycj9jq1um) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Make senders work to get into your inbox","url":"https://daily.dev/posts/make-senders-work-to-get-into-your-inbox-ycj9jq1um","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/make-senders-work-to-get-into-your-inbox-ycj9jq1um"},"datePublished":"2026-07-15T12:51:25.928Z","dateModified":"2026-07-15T13:06:12.419Z","description":"Captchainbox is a service that protects email inboxes from AI-generated cold outreach and spam by requiring unknown senders to either solve a CAPTCHA or pay a...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5da1b6578afe2d2513f197160f95530b?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5da1b6578afe2d2513f197160f95530b?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hacker News","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hacker News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/hn","url":"https://daily.dev/sources/hn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/make-senders-work-to-get-into-your-inbox-ycj9jq1um","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hacker News","item":"https://daily.dev/sources/hn"},{"@type":"ListItem","position":3,"name":"Make senders work to get into your inbox"}]} ```