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 receiving mail servers what to do when a message claiming your domain fails SPF or DKIM checks. Publish a DMARC TXT record after SPF and DKIM are in place so reports and enforcement are meaningful. 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.
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