Mail Server Checker

What this tool checks:

• MX Records - Mail servers that handle email for the domain. Shows priority, hostnames, and IP addresses for connectivity testing.
• SPF Records - SPF (Sender Policy Framework) helps prevent email spoofing by specifying which mail servers are authorized to send email for your domain. The tool breaks down each mechanism to show what sources are allowed.
• DKIM Records - DKIM (DomainKeys Identified Mail) uses cryptographic signatures to verify that emails haven't been tampered with during transmission. The tool checks common selectors and explains each parameter including key type, hash algorithms, and public key details.
• DMARC Records - DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM to provide email authentication and policy enforcement. It tells receiving servers what to do with emails that fail authentication checks.

Why email security matters:

Proper email configuration protects your domain from being used in phishing attacks and ensures legitimate emails from your domain are delivered successfully. Missing or misconfigured SPF, DKIM, and DMARC records can result in your emails being marked as spam or rejected entirely.