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Email Auth

Inspect MX, SPF, DKIM, DMARC, BIMI, and MTA-STS individually after a DNS change, or run the full suite in one pass. Re-check always performs a live dig (+tcp) and clears prior answers in this session.

Email authentication hub Last reviewed Nov 11, 2026 Free, no signup
DKIM discovery helpers

DKIM is at selector._domainkey.domain — not apex TXT. Use the name from Google Workspace, Microsoft 365, or your ESP.

Paste a header from a sent message — we extract s= and d= for an exact lookup, including CNAME-delegated keys.

Enter a domain to audit email authentication records.

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Live
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Starter records

Adapt for your mail provider
SPF 

                

                

                    

                        DMARC
                        
                    

                    

                

            

        


        
            Open DNS Lookup for this domain
        
    


            

    
    
    
    

        
FAQ

                    

                
                
Yes. Fair-use rate limits keep the suite available for everyone.

            

                    

                
                
Yes. CDNs, registry redaction, and heuristics mean you should verify critical findings in your own environment.

            

                    

                
                
Runs are processed to return results. Avoid pasting secrets or personal data you would not put in a public tool.