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
Ensure email deliverability after a brand rename with proper DNS setup. Verify your domain records and test inbox placement with MailTester's real-time.
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Fix email authentication issues in forwarded chains with real-time verification. Reduce bounces, boost deliverability, and validate lists with confidence.
Assess SMTP server risks using the Spamhaus Botnet Controller List. Reduce bounces, prevent blacklisting, and improve deliverability with real-time email.
Discover how ignoring email list quality destroys deliverability, increases bounces, and harms sender reputation.
Discover how MailTester’s email verification service goes beyond Gmail to deliver inbox placement insights and real-time sender reputation metrics.
Learn the correct header order required for DKIM signature validation and avoid email rejection.
Decode spam score reports by understanding each component deduction. Learn what impacts inbox placement and how to fix it with real data.
Use an email verification tool that flags silent discard domains to reduce bounces, improve deliverability, and protect sender reputation in 2026.
Discover how MailTester’s email verification service identifies inbox rotation patterns across providers to boost deliverability and reduce bounces.
Identify and fix common SPF parsing errors in outdated email infrastructure. Prevent deliverability failures with real-time verification and inbox.
Discover how missing STARTTLS support affects email deliverability and increases spam risks. Use MailTester to verify TLS readiness and fix issues before.
Learn step-by-step how to disable app passwords in the Microsoft 365 admin panel to improve security.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
