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.
Inbox placement by mailbox provider: Gmail, Outlook, Yahoo and spam filters
Navigate the Postmaster Tools V2 migration timeline with confidence. Learn what email verification platforms must do, when, and how MailTester adapts.
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Understand how the retirement of Postmaster Tools V1 affects email deliverability and learn actionable steps to maintain inbox placement in 2026.
Understand the legal risks of buying email lists by country in 2026. Learn what's allowed, what's banned, and how to verify your list safely with real.
Secure your Shopify emails with proper domain authentication for Gmail and Outlook. Prevent bounces and boost deliverability with this precise.
Discover how Outlook Safe Links rewriting affects email deliverability and what to do about it. Use MailTester to verify your list and prevent bounces.
Protect sender reputation and inbox placement with real-time blocklist monitoring. Identify, resolve, and prevent blocking across global blacklists.
Discover how email verification reduces bounces, boosts inbox placement, and protects sender reputation during high-volume peak seasons.
Understand the real difference between DSN and NDR in email delivery. Learn how to interpret these alerts and reduce bounces with accurate email.
Learn how Outlook's complaint thresholds impact inbox placement. Use MailTester to verify list quality and reduce complaints before sending.
Use a real-time email verification API to catch undelivered Bcc addresses in transactional emails before they cause delivery failures.
Find the real cost of verifying 50,000 cold email addresses. See MailTester’s pricing, accuracy, and bulk verification speed.
Ensure reliable email delivery with proven DKIM delegation using CNAME records for third-party providers. Reduce bounces and improve sender reputation.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
