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.
Anti-spam laws and compliance: CAN-SPAM, GDPR, CASL
Understand how TRAI's 2026 spam regulations impact commercial email campaigns in India. Learn to verify and clean lists to avoid blacklists and.
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Set realistic bounce rate KPI targets by industry with verified benchmarks. Reduce email failures and boost deliverability using MailTester’s 98.9%.
Test how Apple Mail Privacy Protection affects image rendering and preloading. Ensure your emails look right in real user inboxes with MailTester's.
Keep your email list clean with the latest disposable email domain list update. Verify addresses in real time and reduce bounces with 98.9% accuracy.
Discover the real B2B email list decay rate per year and how to reduce it. Use MailTester to verify your list and improve deliverability.
Stop getting Proton Mail 421 4.7.1 rate limited errors. Learn why it happens and how to prevent it with verified lists and real-time checks.
Stop Gmail 550 5.7.1 errors. Learn why your email was blocked, how to fix it, and prevent future rejections with real-time verification and deliverability.
Stop inbox rejection. Diagnose and fix Barracuda reputation system poor reputation status with real-time verification, deliverability testing, and list.
Understand the received header chain in email—how it tracks delivery path, reveals authentication status, and impacts deliverability.
Learn how Bayesian spam filters detect repeated phrases in bulk email and why it impacts deliverability.
Ensure your emails land in Daum and Kakao Mail inboxes. Use real-time verification, inbox placement testing, and list hygiene to fix deliverability issues.
Protect your brand from typo squatting domains and email spoofing. Use real-time verification to detect invalid, risky, and forged email addresses before.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
