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 deliverability fundamentals and best practices
Protect your email deliverability. Discover how domain squatting and no-reply addresses harm inbox placement and how MailTester's verification API stops.
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Use confidence intervals to estimate email bounce rate accuracy with statistical rigor. Learn how to apply real-world verification data to improve.
Stop ICS attachments from being blocked. Learn how to verify email lists, test inbox placement, and improve deliverability with real tools — no guesswork.
Understand what negative SpamAssassin scores mean for your email deliverability. Fix scoring issues before they hurt inbox placement.
Migrate your DMARC policy in 2026 with confidence. Reduce email fraud, improve deliverability, and avoid inbox failures.
Understand Exchange Online outbound spam and recipient rate limits. Reduce bounces and improve deliverability with real-time verification and list.
Prevent bounce rates and spam complaints by verifying email addresses before sending. Use real-time checks and inbox placement tests to keep your.
Discover how RFC 9057's Author header improves email reputation management, reduces bounces, and boosts inbox placement.
Use automated email verification to identify and exclude out of office responses. Reduce bounces, boost deliverability, and maintain list hygiene with.
Learn how to benchmark your email verification success rates against industry standards. Improve list hygiene and deliverability with real-world best.
Improve inbox placement for fibertel.com.ar and arnet.com.ar addresses. Reduce bounces, fix spam filters, and verify email lists with real-time tools.
Learn when DKIM alignment alone satisfies DMARC policies and why SPF can't align. Improve inbox placement with MailTester’s verification tools.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
