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.
Bounce codes and SMTP errors explained
Fix Gmail SMTP 5.7.8 invalid authentication credentials errors with real steps and tools. Reduce bounces, improve deliverability, and verify your list.
Read article →
Compare Amazon SES and Twilio SendGrid for Africa email campaigns. Test inbox placement, reduce bounces, and improve deliverability with real verification.
Switch from legacy app passwords to modern auth in Google Workspace. Learn how to clean up outdated credentials and improve email security with verified.
Discover how selecting the wrong AWS region can hurt your email verification accuracy and sender reputation.
Fix SPF authentication failures caused by envelope from mismatches in email routing. Reduce bounces, improve deliverability, and verify your addresses.
Monitor your domain health in real time with Postmaster V1. Detect proxy misuse early and protect your sender reputation with actionable insights.
Discover why email verification tests show different results on the same domain. Learn the technical reasons and how to trust your data with accurate.
Discover why SPF redirect mechanisms ignore policies for forwarded emails. Learn how to fix deliverability issues and improve inbox placement with.
Ensure vendors deliver emails reliably by including real-time deliverability monitoring in contracts.
Improve Zoho ZeptoMail deliverability and track open rates with real-time verification and inbox placement testing.
Avoid email delivery failures by understanding SPF record size limits and DNS TXT record constraints.
Fix SPF validation failures from invalid or non-existent domains. Prevent email delivery issues with real-time verification and inbox placement testing.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
