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
Fix DKIM failures on shared mailbox sender domains. Learn how to diagnose and resolve issues affecting deliverability, spam score, and inbox placement.
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Adjust SpamAssassin thresholds to improve email verification accuracy in regulated industries.
Discover why DMARC feedback loop reporting is delayed due to email throttling. Learn how to detect issues early and maintain sender reputation with.
Stop losing deliverability and engagement. Automate email verification and detect record drift in your marketing platforms with real-time alerts and 98.9%.
Understand how SPF include depth limits in RFC 7208 impact email verification accuracy. Prevent fails and improve inbox placement with real-time.
Stop accidental sends to unsubscribed users. Use real-time email verification to validate list health and avoid bounces, spam complaints, and sender.
Resolve DKIM signature failures from outdated DNS keys with our step-by-step guide. Improve email deliverability and sender reputation using real-time.
Learn how long DKIM signatures remain valid during key rotation to maintain email deliverability.
Test email deliverability across Gmail, Yahoo, AOL, and Hotmail with real inbox placement checks.
Build reliable escalation workflows to maintain email deliverability during provider downtime.
Learn how body canonicalization impacts email signature consistency and deliverability. Reduce bounces and improve inbox placement with precise.
Verify email lists with real-time inbox placement testing. Use the test recipient allow-list to check deliverability before sending.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
