---
title: "SPF & DMARC Record Lint — free online checker (no DNS lo"
short_description: "Terraform block or YAML. 19 offline checks on every v=spf1"
emoji: ⚙️
colorFrom: gray
colorTo: yellow
sdk: static
pinned: false
license: mit
---

# 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