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 failing SPF, DKIM, and DMARC in password reset emails with our actionable checklist. Improve deliverability and stop bounces now.
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Stop wasting time on outdated email blocklists. Learn which ones no longer affect deliverability and how to focus on what actually matters—using real-time.
Learn what a Proofpoint blocked message means for your email deliverability. Discover how to diagnose and fix sender issues with real-time email.
Understand DMARC forensic report format ARF and AFRF in 2026. Learn how to interpret and act on real-time email authentication data to stop spoofing and.
Learn how Amazon SES Virtual Deliverability Manager works in 2026. Understand inbox placement, sender reputation, and deliverability metrics — and how.
Check if your domain is on the Barracuda Reputation Block List (BRBL) and learn how to delist.
Stop getting delist portal errors. Diagnose and fix common issues with Microsoft’s delisting tool.
Stop getting blocked by Comcast BL000010. Learn how to diagnose, troubleshoot, and delist from spam blocks using verified delivery practices — and prevent.
Ensure your global campaigns land in Korean inboxes with this verified deliverability checklist.
Ensure compliance with CAN-SPAM’s 10 business days unsubscribe requirement. Learn how to honor opt-out requests and avoid penalties with real-time.
Comply with France's CNIL email rules for B2B outreach. Learn the legal risks, opt-out requirements, and how email verification keeps your list clean and.
Discover whether Gmail blocks or filters image-only emails in 2026. Learn how to improve inbox placement and avoid spam filters with real deliverability.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
