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
Re-warm your email sender after a holiday pause with a proven 2026 plan. Avoid spam traps, rebuild sender reputation, and ensure inbox placement. Start with ver
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Understand the ARF abuse reporting format RFC 5965 with clear, simple explanations. Learn how to use it to improve deliverability and protect your sender reputa
Learn the real timeline for domain aging before sending email. Reduce bounces, avoid spam traps, and improve inbox delivery with proven steps.
Learn how to enroll ESP shared IPs in JMRP when IP ownership is required. Avoid deliverability issues with step-by-step guidance and verification tools.
Learn how to secure your Microsoft 365 email sends with proven authentication best practices. Reduce bounces, boost inbox placement, and protect sender reputati
Navigate Google Postmaster Tools v2 compliance status dashboard with confidence. Learn to read metrics, fix issues, and improve inbox placement—no guesswork.
Compare Gmail API and SMTP warm-up tools. Understand detection risks, sender reputation impact, and how real-time email verification reduces risk. Improve inbox
See how Resend’s use of Amazon SES impacts email deliverability. Learn what it means for your sender reputation, inbox placement, and list hygiene in 2024.
Ensure new users receive onboarding emails with inbox-placement testing. Verify deliverability before launch to avoid missed sign-ups and improve activation rat
If your SendGrid emails are blocked on Spamhaus, act now. Use MailTester to verify your list, check deliverability, and avoid future blocklists.
Understand the real difference between Return-Path and From headers in email. Learn how they impact deliverability, spam filtering, and inbox placement — and
Find a reliable Bouncer-like email verification tool with API integration to reduce bounces and boost deliverability. Test real-time and bulk lists with 98.9% a
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Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
