# DMARCguard

> Email authentication platform monitoring DMARC, SPF, DKIM, BIMI, MTA-STS, TLS-RPT, ARC, DANE, and ARF from one dashboard. SaaS at dmarcguard.io.

## Docs

- [Pricing](https://dmarcguard.io/pricing.md): Plans, features, and founding member discounts
- [Tools](https://dmarcguard.io/tools.md): 30 free email authentication and DNS tools (no signup)
- [Comparisons](https://dmarcguard.io/compare.md): Feature tables vs competitors
- [Research](https://dmarcguard.io/research.md): Original email authentication studies

## Tools

Protocol checkers:

- [DMARC Checker](https://dmarcguard.io/tools/dmarc-checker/): Validate DMARC record, policy, and reporting config
- [SPF Checker](https://dmarcguard.io/tools/spf-checker/): Analyze SPF syntax, lookup limits, authorized senders
- [DKIM Checker](https://dmarcguard.io/tools/dkim-checker/): Verify DKIM key records and selectors
- [BIMI Checker](https://dmarcguard.io/tools/bimi-checker/): Check BIMI record, SVG logo, VMC certificate
- [MTA-STS Checker](https://dmarcguard.io/tools/mta-sts-checker/): Validate MTA-STS policy and TLS enforcement
- [TLS-RPT Checker](https://dmarcguard.io/tools/tls-rpt-checker/): Verify TLS-RPT record and reporting endpoints
- [ARC Validator](https://dmarcguard.io/tools/arc-checker/): Validate ARC chain across forwarding hops

DNS lookup tools:

- [DNS Lookup](https://dmarcguard.io/tools/dns-lookup/): Query any DNS record type via DoH
- [MX Lookup](https://dmarcguard.io/tools/mx-lookup/): Check mail server records, priority, and routing
- [CNAME Lookup](https://dmarcguard.io/tools/cname-lookup/): Inspect canonical name aliases and walk the chain
- [TXT Record Lookup](https://dmarcguard.io/tools/txt-lookup/): Inspect TXT records with SPF/DKIM/DMARC pattern detection
- [Reverse DNS Lookup](https://dmarcguard.io/tools/reverse-dns-lookup/): Resolve IPs back to hostnames via PTR records

Full list at [/tools/](https://dmarcguard.io/tools/).

## Blog

- [DMARC Failed: 7 Common Causes and How to Fix Them](https://dmarcguard.io/blog/dmarc-failed-how-to-fix.md): Troubleshooting guide for DMARC authentication failures

## Research

- [State of Email Authentication 2026](https://dmarcguard.io/research/email-authentication/): 10,000-domain study across 8 protocols and 10 sectors

## Optional

- [RSS Feed](https://dmarcguard.io/rss.xml)
- [Privacy Policy](https://dmarcguard.io/privacy/)
- [Terms of Service](https://dmarcguard.io/terms/)