Measured 2026-06-19 · public DNS
Is chu-lyon.fr protected against email spoofing?
No — chu-lyon.fr has no DMARC policy and can be spoofed.
F
DMARC
absent
SPF
-all
DKIM
2 selector(s)
What this means
- • Aucun enregistrement DMARC publié (_dmarc.<domaine>). Les destinataires n'ont aucune politique à appliquer.
- • Au moins une clé DKIM valide publiée.
How to fix it
Marc, the DMARC copilot, finds every sender, writes the exact DNS, and walks your domain safely from p=none to p=reject.