Free Email Verification Tool: Email checker. No signup required, paste and verify.

We built SMTP Probe because email list hygiene shouldn't be a luxury product. Most email verification tools either lock you behind expensive paywalls or force you through endless signup flows just to check a single address. That felt wrong to us — especially when you're a small business or indie hacker trying to keep your sender reputation clean. So we stripped it down to the essentials: paste an email, hit verify, get a detailed technical breakdown in seconds. No account, no credit card, no friction. Under the hood, we run four serious checks: • DNS MX record lookup • SMTP RCPT TO verification • Catch-all domain detection (the real pain point) • Blacklist & disposable email analysis We've also built a Batch Verification API for teams scaling their outreach, and a blog diving into topics like greylisting and ISP anti-probe behavior — useful even if you don't use our product. What caught your eye when you tried it? We're genuinely curious about feedback. This started as a frustration with existing tools, and we'd love to know if we solved the right problem.