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
Understand why SPF softfail doesn’t block emails but still harms inbox placement. Use real-time verification to fix sender reputation risks before they.
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Fix email delivery delays by verifying addresses before sending. Learn how real-time validation cuts transactional send delays and improves inbox.
Ensure consistent email delivery by securing mail records with DNS provider redundancy. Use MailTester to verify and test email addresses before sending.
Understand how SpamAssassin scores DKIM_INVALID and DKIM_SIGNED to improve email deliverability.
Use automated list hygiene tools to reduce unsubscription rates by filtering invalid, role, and disposable emails.
Fix high bounce rates caused by SPF mechanism misuse. Learn how non-compliant email delivery systems fail and how MailTester’s verification API reduces.
Fix SPH parsing errors from unescaped dots in email addresses with a reliable verification service.
Fix SPF record misconfigurations in shared sending environments. Reduce bounces, avoid blacklisting, and improve deliverability with real-time.
Identify and fix STARTTLS-not-supported errors in your SMTP setup to improve email deliverability and security.
Reduce DMARC feedback loop latency with real-time verification. Fix deliverability issues before they impact sender reputation.
Detect DMARC SPF alignment failures using DNS queries. Verify email authentication setup, fix alignment issues, and improve deliverability with precise.
Use MailTester’s email verification service to uncover old subdomains harming your sender reputation.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
