Email & Mail Server Tools
25 professional tools for SPF, DKIM, DMARC, SMTP testing, and mail deliverability.
MX Health Checker
Validate MX records, priorities, and mail server reachability
SPF Record Checker
Parse and validate SPF TXT records for a domain
SPF Record Generator
Build SPF TXT records from includes and mechanisms
DKIM Record Checker
Look up DKIM public key DNS records by selector
DKIM Key Generator
Generate RSA key pairs and DKIM DNS record entries
DMARC Record Checker
Parse and validate DMARC policy records
DMARC Record Generator
Create DMARC TXT records with policy options
BIMI Record Checker
Check Brand Indicators for Message Identification records
SMTP Server Test
Test SMTP connectivity and banner on mail servers
SMTP Open Relay Checker
Check if an SMTP server allows unauthorized relaying
Email Header Analyzer
Parse email headers for routing, auth, and spam signals
Mail Blacklist Checker
Check IP addresses against major DNS blacklists
Reverse DNS Mail Checker
Verify PTR records for mail server IP addresses
Mail Server TLS Checker
Test STARTTLS support and certificate on mail servers
Email Deliverability Checker
Score email DNS authentication and delivery readiness
Email Authentication Report
Combined SPF, DKIM, and DMARC authentication report
DMARC Alignment Checker
Check SPF and DKIM alignment settings for DMARC
SPF Flattening Tool
Flatten SPF includes to reduce DNS lookup count
SPF Include Analyzer
Analyze SPF include chain and lookup depth
DKIM Signature Validator
Parse and validate DKIM-Signature header fields
Mail Queue Command Generator
Generate Postfix and Exim queue management commands
Postfix Config Checker
Validate Postfix main.cf settings for best practices
Exchange MX Checker
Detect Microsoft Exchange Online mail routing setup
Google Workspace Mail Checker
Verify Google Workspace MX, SPF, and DKIM DNS setup
Microsoft 365 Mail DNS Checker
Verify Microsoft 365 mail DNS configuration