How to set up DMARC for CR Servers hosting
Publish a DMARC TXT record to set a policy for messages that fail SPF or DKIM checks.
DMARC tells receivers what to do when mail claiming to be from your domain fails SPF/DKIM alignment.
Starter record (monitor)
Publish TXT at _dmarc.YOURDOMAIN.com:
v=DMARC1; p=none; rua=mailto:you@YOURDOMAIN.com; pct=100
Start with p=none to collect reports without rejecting mail. After SPF and DKIM look healthy, consider p=quarantine or p=reject.
Requirements
Aggressive policies too early can block legitimate mail from CRMs or marketing tools — change gradually.