Is DNSBL Blacklist Checker free to use?

Yes, DNSBL Blacklist Checker is completely free with no registration required.

Is my data safe with DNSBL Blacklist Checker?

Yes. Most processing happens in your browser. Files uploaded for conversion are processed server-side and automatically deleted.

DNS Blacklist Lookup

Mail Exchange Records

Check MX records for a domain's mail server configuration.

Sender Policy Framework

Validate SPF records for email sender authentication.

DomainKeys Identified Mail

Check DKIM records for email signature verification.

Domain-based Message Authentication

Validate DMARC records for email authentication policy.

SMTP/IMAP Port Test

Test connectivity of common email ports (25, 465, 587, 993).