For Developers

Catch the DNS mistake
before your users do.

DNS misconfiguration is behind more production incidents than most engineers want to admit. Run a full 72-check audit on any domain in under 5 seconds — before you deploy, after a migration, or any time something starts behaving oddly.

Run Free Report →

Free. No account. No install.

DNS problems are invisible until they're catastrophic.

You've migrated your mail infrastructure. The MX records look right. SPF is updated. You ship.

Three days later, a client calls to say their emails are bouncing. Or they're going to spam. Or they never arrived at all.

You open your DNS provider, stare at the records, and everything looks fine — because you're looking at what you set, not whether it's working correctly.

Common scenarios DNSSnuff catches:

  • ✗ SPF record exceeds 10 DNS lookup limit — silently breaks authentication for some recipients
  • ✗ DMARC set to p=none — your domain can be spoofed with zero protection
  • ✗ MX record pointing to a CNAME — violates RFC 5321, rejected by some mail servers
  • ✗ Multiple SPF records — causes immediate authentication failure
  • ✗ DKIM key under 1024 bits — rejected by modern mail platforms
  • ✗ Certificate expiring in 7 days — one week to a browser trust warning
  • ✗ HTTP not redirecting to HTTPS — affecting SEO and security
  • ✗ Nameservers returning inconsistent answers — intermittent resolution failures

How developers use DNSSnuff

As a pre-deployment checklist

Before any infrastructure change that touches DNS, run a before-and-after report. Catch problems before traffic hits the new configuration. Takes 5 seconds.

After a mail infrastructure migration

Migrated to Google Workspace? Microsoft 365? A new email service provider? Run a report immediately after updating DNS. Verify SPF, DKIM, and DMARC are correctly configured before any email is sent.

When debugging deliverability issues

"Our emails are going to spam" is almost always a DNS problem. Run a report, go straight to the Email Authentication section, and you'll usually find the issue in 30 seconds.

When you inherit a messy domain

Take over a domain and need to understand the current state? One report gives you a complete picture — what's configured, what's misconfigured, and what's missing entirely.

What you get

Full 72-check report — free, always.

  • Parent zone delegation
  • Nameserver configuration & redundancy
  • SOA record health
  • Mail server configuration
  • SPF, DKIM, DMARC, BIMI
  • SSL certificate validity & expiry
  • DNSSEC chain of trust
  • 50+ blacklist cross-references
  • Health score & letter grade
  • "Fix This First" priority stack
  • Plain-English verdicts with fix instructions
  • Shareable report URLs

API access Pro

Integrate DNS health checks into your own tooling. Pull check results programmatically, integrate into dashboards, or add DNS health as a deployment gate.

GET https://api.dnssnuff.com/v1/report?domain=yourcompany.com
Authorization: Bearer YOUR_API_KEY

Response includes: health score, letter grade, per-check results with status, severity, and remediation instructions. Read the API docs →

Run a check on your domain right now.

Free. No account. No install. Results in under 5 seconds.

Run Free Report →