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.
Sender reputation, IP warm-up and sending infrastructure
Find out how long sender reputation takes to recover after a sending pause. Learn the mechanics, benchmarks, and how email verification helps prevent.
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Discover why your emails land in the Microsoft 365 high-risk delivery pool, how it impacts inbox placement, and how to fix it with real-time verification.
Discover real 2026 email client market share stats for mobile and desktop. See what impacts inbox placement and deliverability.
Decode TLS-RPT report JSON format fields to improve email security and compliance. Learn what each field means and how to act on it.
Boost bulk email delivery speed and reliability by optimizing SMTP session efficiency. Reduce bounces, improve sender reputation, and cut infrastructure.
Avoid deliverability disasters. Discover the real risks of SPF flattening tools in 2026 — and how to verify email addresses safely with real data, not.
Stop losing deliverability to auto-reply bounces. Use real-time verification to find and remove vacation responder emails before they hit your list.
Compare open source DMARC report parsers like parsedmarc. Learn setup, limitations, and how MailTester delivers verified inbox placement without code.
Secure and automate email verification with a real-time API for scheduled data exports. Reduce bounces, improve deliverability, and maintain list hygiene.
Ensure your emails reach Oi, Vivo, and Claro inboxes with proven deliverability testing. Verify addresses, reduce bounces, and boost inbox placement now.
Understand how mailbox provider reputation tiers impact deliverability. Learn how to check and improve your sender reputation with verified, real-time.
Ensure compliance with GMX and web.de unsubscribe requirements. Learn how to implement the Abmelden link correctly and avoid bounces with verified email.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
