Free deliverability tool
DMARC Record Checker
Look up the DMARC policy that tells mailbox providers what to do when SPF or DKIM fails for your domain.
What is DMARC?
DMARC (Domain-based Message Authentication, Reporting & Conformance) ties SPF and DKIM together. It tells receivers what to do when authentication fails — and where to send aggregate reports so you can monitor impersonation attempts and broken senders.
The three policies
p=none— monitor only. Always start here.p=quarantine— failing mail goes to spam.p=reject— failing mail is dropped. Strongest policy.
Why DMARC matters for cold email
Google and Yahoo's 2024 sender requirements made DMARC effectively mandatory for bulk senders. Without it, deliverability collapses to Promotions or Spam, no matter how good your content is.
Recommended starting record
v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com; pct=100; adkim=s; aspf=s
Run in monitor mode for 2–4 weeks, then move to quarantine and finally reject.
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