The Blog
Hard-won lessons on email verification, inbox placement, and keeping your sender reputation spotless — from the team that's been verifying email since 2000.
Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS
Discover why DKIM signature alignment with the envelope sender is crucial for accurate email verification.
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Fix email deliverability issues by optimizing SPF mechanism order. Use real-time verification and inbox placement testing to ensure your emails reach.
Detect email blacklisting in real time with MailTester’s extension. Verify addresses instantly, avoid bounces, and improve inbox placement with accurate.
Ensure every email template reaches real inboxes. Automate verification checks across your entire send pipeline—reduce bounces, improve deliverability.
Learn how SpamAssassin uses receiver interaction history to adjust spam scores dynamically. Improve inbox placement with real-time email verification and.
Learn how to simulate header injection attacks to test the security and accuracy of email verification platforms.
Learn how to parse SPF records with nested include mechanisms to improve email deliverability and avoid inbox placement issues.
Resolve the 5.7.8 error when using email verification tools. Learn why credentials fail, how to diagnose it, and how MailTester’s real-time API avoids.
Discover whether email warm-up services truly build domain reputation—or if they're just overpriced automation.
Enforce DMARC policies on emails with modified headers using automated verification. Reduce spoofing, boost sender reputation, and improve inbox placement.
Stop wasting sends on typo traps. Discover how email verification tools detect and block fake addresses that hurt deliverability and damage sender.
Fix SPF limits caused by include mechanisms. Prevent DNS query overloads and improve email deliverability with real-time verification and bulk list.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
