Long lookup… still querying DNS

Check your DNS certificates

Use our Certificate Checker to quickly see if a domain is configured for sending emails. This tool inspects DMARC, SPF and DKIM records to detect issues.

SPF

SPF is Sender Policy Framework: it lists servers authorized to send emails for your domain.

DKIM

DKIM is DomainKeys Identified Mail: it signs emails; the public key is published in DNS.

Testing multiple known selectors (stops at the first found)

DMARC

DMARC is Domain-based Message Authentication, Reporting & Conformance: it defines the policy if SPF/DKIM fail and where to send reports.

TXT lookup on _dmarc.<domain>