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Email & DNS Diagnostics Tools

Explore 22 free Email and DNS diagnostic tools for MX, A, AAAA, SPF, DMARC, DKIM, SMTP and DNS record checks. The collection is organized for domain owners, mail administrators and technical users and focuses on diagnosing public email and DNS configuration without paid APIs.

What you can do with Email & DNS Diagnostics tools

Domain owners, mail administrators and technical users can use these tools directly in a modern browser. Each tool has a dedicated page with its purpose, instructions, result guidance and links to closely related utilities.

Choose a tool by name or filter the category. For calculations, verify units and assumptions before relying on the result. For text, document, web and diagnostic tools, review generated output before using it in production, publication or formal decisions.

22 free toolsDedicated pagesMobile friendlyNo registration required

Browse Email & DNS Diagnostics tools

Email & DNS Diagnostics

A Record Lookup

A Record Lookup implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

AAAA Record Lookup

AAAA Record Lookup implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

BIMI Record Checker

BIMI Record Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

DKIM Record Checker

DKIM Record Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

DMARC Record Generator

DMARC Record Generator implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

DMARC Record Checker

DMARC Record Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

DNSBL Blacklist Checker

DNSBL Blacklist Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

Domain Health Checker

Domain Health Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

Email Extractor

Email Extractor implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

Email Header Analyzer

Email Header Analyzer implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

HTTP Availability Checker

HTTP Availability Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

HTTPS Availability Checker

HTTPS Availability Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

MTA-STS Record Checker

MTA-STS Record Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

MX Record Lookup

MX Record Lookup implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

NS Record Lookup

NS Record Lookup implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

SMTP Banner Checker

SMTP Banner Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

SOA Record Lookup

SOA Record Lookup implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

SPF Record Generator

SPF Record Generator implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

SPF Record Checker

SPF Record Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

TCP Port Checker

TCP Port Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

TLS-RPT Record Checker

TLS-RPT Record Checker implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →Email & DNS Diagnostics

TXT Record Lookup

TXT Record Lookup implemented with direct DNS, socket or HTTP checks and no MXToolbox API key.

New · usage tracking activeOpen tool →