SPF, DKIM & DMARC Builder
Build email authentication TXT records with IP/include checks, DKIM public-key input and explicit rollout warnings.
email-dnsLOCAL WORKSPACE
1. Configure and explore
Inputs stay in this tab; no browser persistence, page-URL encoding or network requests.
2. Results and interpretation
Choose a sample, fill the fields or explore the flow.
No DNS query or delivery test occurs. Nested SPF lookup counts, DKIM key validity, alignment and live ownership are not verified.
Data / rules date: 2026-10-21 · Official source · DMARC RFC 7489
How to use this tool
Enter your domain, known senders and provider public key. Start DMARC with monitoring and review DNS TXT chunks before publishing.
When not to use it
No DNS query or delivery test occurs. Nested SPF lookup counts, DKIM key validity, alignment and live ownership are not verified.
Read the guide →