Free Email Security Tools

Check, build, and generate DNS records for DMARC, SPF, DKIM, BIMI, and MTA-STS. No account required.

Checkers & Analyzers

Domain Health Checker

Comprehensive email security audit with SPF, DKIM, DMARC, MTA-STS, BIMI checks and a letter grade.

Check health

Domain Security Scanner

Instantly check your domain's DMARC, SPF, and DKIM configuration with a detailed security score.

Scan now

SPF Record Checker

Look up and validate SPF records with a full recursive lookup tree, DNS lookup count, and issue detection.

Check SPF

DNS Lookup

Query A, AAAA, CNAME, MX, TXT, NS, SOA, and SPF records for any domain.

Look up

Email Header Analyzer

Parse authentication results, routing hops, and delivery delays from raw email headers.

Analyze headers

Generators & Builders

SPF Record Builder

Build a valid SPF record by selecting mechanisms and policy. Live preview with copy to clipboard.

Build SPF

DMARC Record Generator

Configure DMARC policy, reporting, and alignment options with a live preview of your DNS record.

Generate DMARC

DKIM Key Generator

Generate 1024 or 2048-bit RSA key pairs for DKIM email signing. Get your DNS record instantly.

Generate keys

SPF Flattener

Resolve includes into IP addresses to reduce DNS lookups and stay under the 10-lookup limit.

Flatten SPF

MTA-STS Generator

Generate MTA-STS DNS record and policy file to enforce TLS encryption on inbound email.

Generate MTA-STS

BIMI Record Generator

Create a BIMI DNS record to display your brand logo in email clients like Gmail and Yahoo.

Generate BIMI

Want automated email security?

DMARC Busta's Autopilot manages your SPF, DKIM, and DMARC records automatically with AI-powered source approval and progressive enforcement.

Get Started Free