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.
Cold email deliverability and warm-up
Detect spam risks before sending campaigns with Postfix and Rspamd outbound scanning. Reduce bounces and improve inbox placement using real-time email.
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Stop wasting sends on invalid emails. Automate bounce suppression to reduce hard bounces, protect sender reputation, and improve inbox placement with.
Learn how to configure DMARC sp=none and sp=reject policies with real subdomain examples. Improve email deliverability and security with proven setup.
Discover how strong the signal is when moving email from spam to inbox. Use real verification to fix deliverability, reduce bounces, and improve sender.
Avoid Yandex Mail bounces and blocks. Learn exact rate limits per IP and per connection in 2026.
Understand how mailbox.org's spam filtering and greylisting impact your email deliverability. Use real-time verification to check inbox placement and.
Learn why DANE requires DNSSEC-signed zones and what happens when it doesn’t. Understand the security foundation of modern email transport and how.
Set up a cron job for DNSBL monitoring with real-time alerts. Prevent deliverability issues before they hit your inbox.
Ensure your email tracking pixels comply with GDPR. Learn how to implement open tracking consent, avoid fines, and protect user privacy — all with.
Learn how Gmail's Feedback Loop identifies spam reports by unique identifiers. Use MailTester to detect risky addresses before they hurt your.
Learn how Gmail handles SPF softfail with DMARC ~all. Reduce bounces and improve inbox placement with accurate email verification and deliverability.
Discover the true Yahoo CFL complaint volume benchmark for a healthy sender in 2026. Learn how to stay below the threshold and avoid inbox placement.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
