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 authentication: SPF, DKIM, DMARC, BIMI and MTA-STS
Understand how DKIM signature collisions disrupt SPF and DMARC alignment. Use MailTester’s real-time verification to detect alignment issues before.
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Prevent verification pipeline failures from DMARC parsing timeouts. Learn how to detect, diagnose, and fix timeout issues in high-volume email.
Discover why DMARC records take time to enforce across multi-domain email platforms and how to verify your domains faster with accurate, real-time tools.
Optimize email deliverability with proven deferral retry timing best practices. Reduce bounces and improve inbox placement using real-time verification.
Fix SPF record scope too broad with multiple domains listed. Learn why it's a deliverability risk and how to correct it safely with real steps and.
Diagnose and fix DMARC report failures caused by incorrect email routing. Use real-time verification to validate sender configurations and prevent.
Implement an automated sunset policy for email lists to reduce bounces, improve sender reputation, and boost open rates.
Learn how sender reputation scores influence inbox placement decisions at mailbox providers. Reduce bounces, avoid spam traps, and improve deliverability.
Learn how to scale DMARC report ingestion without errors. Avoid data loss, parsing failures, and false positives with proven strategies and tools.
Verify email domains for IPv4 and IPv6 connectivity with MailTester's accurate, real-time API. Reduce bounces and boost deliverability.
Cut hard bounces in Braze and Customer.io with real-time email verification. Clean your list, improve deliverability, and boost inbox placement with.
Fix SPF record validation short-circuit errors from too many include tags. Prevent email delivery failures with actionable steps and real-time.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
