Show HN: 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 the further roadmap, I plan to provide more services around email deliverability. This includes Inbox placement, Backlist monitors and DMARC Analyzer.

I’m happy to answer questions, take criticism, and generally hear what you think.