getreadystack/spf-dmarc-record-lint
0
SPF & DMARC Record Lint — free online checker (no DNS lookup needed)
Paste a zone file, Terraform block or YAML. 19 offline checks on every v=spf1, v=DMARC1 and v=DKIM1 string, including the May 2026 DMARCbis changes (pct removed, np=, t=). Runs in your browser; nothing is uploaded.
Runs entirely in your browser. Nothing is uploaded, nothing is stored.
Full version
Every variant of this tool, ready to download:
[getreadystack.com](https://getreadystack.com/tools/spf-dmarc-record-lint)
Free - MIT