I built a service to detect invalid and malicious email addresses
Hello HN, around October last year, I started to work on campaignkit.cc as a side project. It is a service to detect invalid and malicious email addresses. You can upload text files, and use the REST API or direct integration to retrieve a detailed report for each email address. End of March I added Stripe Payments and got my first paying customers via SEM. A coworker suggested starting a Show HN thread, so here we are :) I used golang for the backend since I wanted something lightweight with fast compilation times (coming from scala). For the frontend, I'm using Next.js and TailwindUI. On…
I built a service to detect invalid and malicious email addresses launched on April 21, 2022 with 5 votes, #1,160 of 2,974 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 4 years on.
What it does
Email validation service. Clean your email lists to reduce bounces. Email List cleaning doesn't have to be expensive. Start your free trial today.
Validate email addresses in real-time to protect your sender reputation and maximize deliverability. Join 1,000+ companies sending better campaigns. Test our service. Verify an email address to get a detailed report. Get started in minutes with our intuitive platform designed for marketers and developers alike. Import your email list via CSV, Excel, or connect directly through our API or integrations. Our system validates each email in under 1 second, checking syntax, domain, mailbox, and detecting spam traps. Get a detailed report with validation scores and download only verified, deliverable emails. Sync validated contacts automatically. No CSV uploads, no manual work. “ Out of all the…from campaignkit.cc
In the maker’s words, at launch
Hello HN, around October last year, I started to work on campaignkit.cc as a side project. It is a service to detect invalid and malicious email addresses. You can upload text files, and use the REST API or direct integration to retrieve a detailed report for each email address. End of March I added Stripe Payments…
Does a similar job
all alternatives →
I made a MailChimp alternative that connects to your database2023 · cc.dev · ▲302Hi all! Excited to share cc.dev after months of work and refinement. The idea for this product came from trying to do email marketing for my side project, CubeDesk, a site where Rubik's Cube enthusiasts can time themselves, race with one another, train algorithms — it's a fun niche! With over 40k users, sending even a single campaign was becoming expensive with MailChimp. I knew AWS SES would be much cheaper, but it’s just an API with none of the other necessities you need for a robust email marketing platform. Beyond cost, I was also frustrated with having to make sure my database was…
AhaSend2024 · ahasend.com · ▲132I'm the founder of AhaSend. We've built a transactional email service specifically for developers, with a Pay-As-You-Go pricing model ($0.50 per 1,000 emails) and up to 70% volume discount for platform partners. While there are many ESPs out there, we focused heavily on the Developer Experience to solve the pain of building and testing email flows: * The CLI: Heavily inspired by the Stripe CLI, we built a tool that lets you develop and debug locally. You can listen to webhooks, trigger events, manage your domains, and send / list / debug messages directly from your terminal. * True…
Every open source tool from the "What's HN working on" thread2024 · github.com · ▲169Public datsets made with https://getomni.ai/. Contribute to getomni-ai/datasets development by creating an account on GitHub.
DeepSeek Your HN Profile2025 · hn-wrapped.kadoa.com · ▲121A fun project that I built to try out R1 Distill Llama 70B. Enjoy :)
Email API benchmarksMar 2026 · knock.app · ▲113Hey HN, I'm Chris, CTO of Knock (https://knock.app). We built email.info because every developer we talk to asks the same question: which email provider should I use? The existing resources are mostly vibes — "Best of" listicles, anonymous Reddit threads, or LLM answers trained on that same content. Objective performance data is always missing. Knock is a notification infrastructure platform, so we send billions of API requests to downstream email providers every year. We aggregated that data into a public dashboard covering 10 providers (SendGrid, Postmark, Resend, Mailgun, Amazon…
A native Hacker News reader with integrated todo/done tracking2025 · github.com · ▲54Hey HN! I'm excited to share a tool I've been working on - a native Hacker News reader built with Rust and egui. Here's a screenshot: https://github.com/haojiang99/hacker_news_reader/blob/main/s.... As a daily HN reader, I've always struggled with keeping track of interesting posts I want to read later. Browser tabs pile up, bookmarks get forgotten, and I lose track of what I've already read. I needed a way to: 1. Browse HN efficiently (across all sections - hot, new, show, ask, jobs, best) 2. Quickly mark posts as "todo" for later reading 3. Mark posts as…
More dev tools this month
the category →
Contribute to oosexgang/hackios-xnu-kernel development by creating an account on GitHub.
Dev tools · 20h ago · github.com
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 29d ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 27d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 24d ago · openbot.run
Talanoa▲346Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 22d ago · talanoa.email
Source: Show HN post ↗ · launch text quoted in part
Launched alongside, April 2022
the whole month →
Hi HN community, I’m Zach, founder and CEO of Warp, and am excited to show you Warp, a fast Rust-based terminal that’s easy to use and built for teams. As of today, Warp is in public beta and any Mac user can download it. It works with bash, zsh, and fish. The terminal’s teletype-like interface has made it hard for the CLI to thrive. After 20 years of programming, I still find it hard to copy a command’s output; I always forget how to use `tar`; and I always have to relearn how to move my cursor. To fix fundamental accessibility issues, I believe we need to start innovating on the terminal,…
AI · 2022 · warp.dev
Slow Social is a online social network built for growing and sustaining friendships.
Life & fun · 2022 · slowsocial.us
Implement scanyourpdf.com in JavaScript. No backend servers needed.
Life & fun · 2022 · lookscanned.io
