• Service Categories
    • Anti-spam services fall into three main categories: postmasters, validators, and pre-sending checks
    • Postmasters provide deliverability analytics from email providers
    • Validators evaluate database quality and remove invalid addresses
    • Pre-sending checks evaluate email likelihood of spam
    Postmasters
    • Free services showing domain reputation and spam statistics
    • Each postmaster requires separate registration
    • Provide detailed delivery failure and authentication monitoring
    Validators
    • Free versions available, paid for constant use
    • Check for non-existent emails, spam traps, and double addresses
    • UniSender includes built-in validator functionality
    Pre-Sending Checkers
    • Mail-tester evaluates emails before sending
    • MxToolBox offers comprehensive domain health monitoring
    • GlockApps provides detailed deliverability analysis
    • Postmark shows SpamAssassin score for free
    • SendForensics offers GDPR compliance and device preview

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