Email Authentication Tools
Free checker tools that run real DNS lookups against your domain — no signup, no email required. Not sure what these mean? Start with our SPF, DKIM & DMARC explainer.
SPF Checker
Look up your domain's SPF record, see it broken down mechanism by mechanism, and catch common mistakes like a missing "all" or too many DNS lookups.
ToolDKIM Checker
Check whether a DKIM record exists for a given selector, and confirm the public key is present and valid.
ToolDMARC Checker
Look up your DMARC policy and see, in plain English, what it actually tells receiving mail servers to do.
ToolMX Record Checker
See which mail servers are configured to receive email for a domain, and whether there's redundancy if one goes down.
ToolEmail Header Analyzer
Paste raw email headers to see the delivery path, hop-by-hop delays, and SPF/DKIM/DMARC results in plain English.
These tools query DNS directly and don't store the domains you look up.