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
Evaluate if CMC BIMI is worth the cost for your startup. Learn how email verification and deliverability testing can boost inbox placement and brand.
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Learn how to build a self-hosted synthetic monitoring network to track email delivery in real time.
Verify your merged email list to reduce bounce rates and spam complaints. Use real-time tools to clean invalid addresses and improve deliverability.
Learn the actual limits of SMTP relay services, including size caps, attachment constraints, and how to avoid delivery failures.
Learn how to submit a Proofpoint PDR delisting request form and understand the typical timing.
Build email delivery health dashboards without relying on Gmail. Use real-time verification, inbox placement testing, and integrations to track sender.
Discover why emails vanish into Gmail’s silence. Learn the hidden triggers — from spam signals to sender reputation — and how to fix them with real-time v.
Benchmark your email validation success rate across retail and travel industries. Reduce bounces, improve deliverability, and boost engagement with.
Verify email lists and test deliverability to meet government-grade authentication thresholds for bulk mail in 2026.
Prevent blacklisting with version-controlled DNS audits. Detect misconfigurations early, reduce bounces, and maintain sender reputation using real-time.
Discover how proxy signals impact domain reputation in Postmaster V1 email deliverability. Use MailTester to verify your list and maintain sender health.
Compare Yahoo TSS04 and TSS11 deferral codes: what they mean, why they matter, and how to fix them.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
