Free DNS health check
Check a domain's email authentication setup. Missing SPF, DKIM, or DMARC records are the most common reason cold email lands in spam folders.
Why these four records matter
- MX tells the world where to send mail addressed to your domain.
- SPF lists which servers are allowed to send mail as your domain. Without it, your mail looks forgeable.
- DKIM cryptographically signs outgoing mail so receivers can verify it wasn't tampered with.
- DMARC tells receivers what to do when SPF or DKIM fail (reject, quarantine, or just monitor).
Gmail and Outlook now require SPF + DKIM + DMARC for bulk senders. Missing any of them is the fastest way to land in spam.
Need to verify 10,000 emails at once?
Bulk email verifier checks every address against the real mailbox, rescues catch-alls, and returns a clean CSV. No subscription — pay per credit, with auto-refunds on uncertain results.
Other free tools
- Email syntax checker — Validate one email address
- MX lookup — Find a domain's mail servers
- Email extractor — Pull emails out of text
- Disposable email check — Detect temp / throwaway emails