DMARC tells inboxes what to do with mail that fails authentication. Google and Microsoft now require it from bulk senders. Check yours.
Privacy: this tool runs entirely in your browser. When you click Check, one DNS query for the domain you typed goes to Cloudflare's public DNS resolver (Google's as fallback). Nothing is stored, logged or sent to GrowthPal.
DMARC ties SPF and DKIM together and tells receiving servers what to do when a message fails both: deliver it anyway, quarantine it, or reject it. In 2024 Gmail and Yahoo made it mandatory for bulk senders, and inboxes have only gotten stricter since.
For cold email, every sending domain needs all three records before warmup even starts. Skipping this step is mistake number one in the old playbook.
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