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
Compare Rspamd and SpamAssassin spam score thresholds. Understand how each system evaluates emails and impacts deliverability.
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Discover how overly complex SPF records harm ESP deliverability. Learn to verify and simplify SPF configurations for better inbox placement and sender.
Fix SPF record syntax errors that cause email verification services to incorrectly flag domains.
Stop losing deliverability to iCloud Mail. Use real-time verification and inbox testing to catch invalid addresses before they bounce — no feedback loop.
Prevent Gmail 4.7.28 errors with proven exponential backoff strategies. Reduce bounces, improve deliverability, and maintain sender reputation in 2024.
Speed up email verification with pipeline processing. Cut latency, scale bulk checks, and improve deliverability with real-time API integration and.
See how email verification directly impacts revenue by reducing bounces, improving deliverability, and boosting campaign ROI. Start with 100 free checks.
Learn how to decode SMTP logs to identify invalid emails, catch-alls, and delivery issues. Reduce bounces and improve deliverability with real-time.
Fix SPF domain scope mismatches that block email delivery. Verify your setup and ensure third-party services are in scope with real-time checks and bulk.
Learn whether you must include a physical mailing address in commercial emails. Understand legal requirements, deliverability risks, and how email.
Discover why on-call incident alerts fail to reach engineers and how email verification reduces delivery failure rates by 90% or more.
Enforce DMARC effectively across hybrid email platforms. Reduce phishing, improve inbox placement, and protect sender reputation with actionable.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
