Free tool
Domain Reputation Checker
Enter a domain for a reputation grade built from its MX, SPF, DMARC and blacklist status. Advanced mode adds DKIM detection and reverse DNS on the resolved IP.
How it works
- 1Enter your sending domain (e.g. yourcompany.com).
- 2We check MX, SPF, DMARC and blacklist status live via DNS.
- 3Advanced: add DKIM selector detection and PTR on the resolved IP for a fuller grade.
Questions
Frequently asked
What makes up domain reputation?
Mailbox providers weigh authentication (SPF/DKIM/DMARC), whether you're blacklisted, and your sending history. This tool grades the public, checkable signals.
How do I improve a poor grade?
Publish and tighten SPF, DKIM and DMARC, get delisted from any blacklists, and keep your list clean so sending history stays healthy.
Can I check a whole list at once?
This free tool checks one at a time. To verify a full list — email, phone and company together — upload a CSV to BounceBlock and preview your first 100 rows free.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.
100 free creditsNo credit cardCancel anytime