SPF / DKIM / DMARC Checker
Validate TXT records and highlight common misconfigurations.
What to look for
- SPF: a single record, terminal policy (~all or -all), DNS lookups ≲ 10.
- DKIM: correct selector and a published public key (p=...).
- DMARC: p=quarantine/reject for enforcement, rua= for reports, alignment (adkim/aspf).