Hey Product Hunt 👋

I’m Ridwan, and I built MailCheckr.

Every time I sent to a list I hadn’t checked, I’d see bounces, hurt sender reputation, and have no clear idea which addresses were the problem. Most verification tools give you a “valid/invalid” answer and leave you guessing why. I wanted something that shows its reasoning.

What MailCheckr does:

✅ Checks the address format, the domain’s MX records, disposable-domain and role-account signals, and SMTP mailbox and catch-all evidence when it’s available.

🔍 Returns a status and a reason, so you can see what informed every result.

📄 Bulk verification: upload a CSV, follow its progress, export the results.

🧑‍💻 REST API with official SDKs for Laravel, Node.js, Python and Go, plus a community Ruby SDK.

🛠 Free DNS tools: DMARC, SPF, DKIM, MX, CNAME and DNS lookups.

Pricing is simple: pay as you go, no subscription. One credit per completed check, and failed checks are refunded.

One honest note: if a mail server hides mailbox information, MailCheckr returns “unknown” rather than guessing “valid”. I’d rather give you an accurate answer than a confident wrong one.

I’d love your feedback, especially from anyone sending at scale or wiring verification into a signup flow. What would make this a no-brainer for you?

I’ll be here all day answering questions 🙌