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 verification and list hygiene for deliverability
Improve deliverability and reduce bounces in Lebanon, Syria, and Palestine with accurate email verification.
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Ensure compliance with Mexico's LFPDPPP email marketing rules. Verify lists, manage consent, and reduce bounce rates with accurate email verification.
Ensure your Substack newsletters land in inboxes, not spam. Use real-time verification and inbox placement testing to reduce bounces, avoid blocklists.
Boost your Substack email deliverability with proven tactics. Clean your list, verify addresses, and test inbox placement to reduce bounces and increase.
Master email deliverability on call with a proven runbook. Automate feedback loop detection, reduce bounces, and improve inbox placement using real-time.
Learn how Docker containers enable scalable, reliable synthetic mailbox monitoring for improved email deliverability testing and list hygiene.
Understand what happens when a DKIM signature expires — and how email verification prevents delivery failures before they occur.
Fix Comcast email delivery issues by validating PTR records and HELO settings. Prevent bounces and improve inbox placement with verified sender.
Prevent email blacklisting by proactively monitoring domain expiration. Use real-time verification to catch expired domains before they break.
Decode WP.pl, Onet, and Interia SMTP reply codes with our complete 2026 bounce codes reference.
Learn when to use DMARC forensic reports versus aggregate reports for stronger email security.
Discover how the end of Postmaster Tools V1 reshaped email deliverability metrics. Learn how to maintain inbox placement and sender reputation with.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
