DMARC record generator
Start with monitoring, then tighten the policy. How DMARC works
Policy (p)
Receivers take no action; you only get reports.
Subdomain policy (sp)
Daily XML summaries. Strongly recommended.
Per-message samples. Few receivers send them.
DKIM alignment (adkim)
SPF alignment (aspf)
Relaxed allows subdomains (mail.example.com) to align with example.com. Strict requires an exact match.