Free tools

SPF, DKIM, DMARC and blacklist checkers

Four checks for the records receivers read before they read your message. Type a domain, an IP or a selector and get the answer from live DNS, with the RFC section next to most findings.

SPF

SPF Checker

Syntax, the include chain and the ten-lookup limit.Open the checker DMARC

DMARC Checker

Policy, alignment and who receives the reports.Open the checker DKIM

DKIM Checker

The published key for a selector: type, size and flags.Open the checker RBL

Blocklist Checker

IP and domain blocklists, list by list.Open the checker

Test a real message instead

These tools read DNS. The full test reads the email itself: send one message to a disposable address and get SPF, DKIM and DMARC as a receiver evaluated them, blocklists, content, both spam scores and a fix plan. Add inbox placement to see the folder it lands in at Gmail, Outlook, Yahoo and other providers.

Test your email View sample report