# Free SPF, DKIM & DMARC Checker

> Look up MX, SPF, common DKIM selectors, and DMARC for any domain. Add a custom DKIM selector if your ESP uses one we do not try by default.

```yaml
url: "https://www.scrolllaunch.com/tools/email-auth-checker"
slug: email-auth-checker
category: onpage
keywords: "dmarc checker, spf checker, dkim checker, spf dkim dmarc checker, email authentication checker, dmarc record checker"
```

## How to use

1. **Enter the sending domain** - The apex you send from (usually without www).
2. **Add a selector if you have one** - Optional. Leave blank to try google, selector1, k1, and others.
3. **Fix failing checks** - Publish one SPF TXT, at least one DKIM selector, and a _dmarc record.

## How to check email authentication

Launch week newsletters fail when SPF, DKIM, or DMARC are missing. Receivers treat unsigned mail as spam.

Start with p=none on DMARC to monitor, then move to quarantine or reject once SPF and DKIM align with your ESP.

DKIM selectors are not guessable. We try common names; paste the selector from Google Workspace, Resend, Postmark, or Mailgun if needed.

## What you get

- SPF + DMARC TXT
- Common DKIM selectors
- MX present / missing
- Optional custom selector

## Related tools

- **[DNS Lookup](https://www.scrolllaunch.com/tools/dns-lookup)** - Free DNS lookup - A, AAAA, CNAME, MX, NS, TXT, and SOA records for any domain.
- **[SSL Checker](https://www.scrolllaunch.com/tools/ssl-checker)** - Free SSL checker - certificate validity, expiry, issuer, and SAN names.
- **[HTTP Header Checker](https://www.scrolllaunch.com/tools/http-header-checker)** - Free HTTP header checker - inspect status, security headers, caching, and X-Robots-Tag.
- **[WHOIS Lookup & Domain Age](https://www.scrolllaunch.com/tools/whois-lookup)** - Free WHOIS and domain age checker - registration date, expiry, registrar, and nameservers via RDAP.

## Related

- [All tools](https://www.scrolllaunch.com/tools)
- [Pricing](https://www.scrolllaunch.com/pricing) - launch free; dofollow while the badge stays on your site.
- [Directories](https://www.scrolllaunch.com/directories) - curated startup directories ranked by DR.