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 blocklists: monitoring, causes and delisting
Find out how many spam trap hits can lead to a Spamhaus IP listing. Learn how email verification prevents traps and protects sender reputation.
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Understand how the SparkPost to Bird rebrand impacts email deliverability. Learn what changed, what stayed the same, and how to verify your list with.
Monitor Yahoo Mail sender reputation and inbox placement with real-time verification. Reduce bounces and improve deliverability with accurate email.
Fix iCloud Mail SPF mismatch issues that hurt deliverability. Learn how to diagnose and resolve them with real-time verification and inbox placement.
Stop your cold emails from landing in spam. Learn how to verify addresses, clean lists, and improve inbox placement with real tools and data-driven.
Learn how to configure DMARC for Microsoft 365 and Outlook.com to improve inbox placement, reduce bounces, and protect your sender reputation with.
Learn how to interpret SNDS sample messages and identify spam patterns. Use MailTester’s inbox placement tests to reduce bounces and improve.
Master SparkPost Bird IP pool strategy to avoid deliverability issues. Use real-time verification and inbox placement testing to validate sends and reduce.
Check your one-click unsubscribe compliance status in Postmaster Tools v2 and fix email deliverability risks before they impact inbox placement.
Learn how VERP return-path formatting impacts DMARC alignment and inbox placement. Prevent authentication failures with real insights and verification.
Compare Amazon SES and SendGrid for high-volume marketing sends. See which delivers better inbox placement, lower bounce rates, and stronger.
Optimize your SendGrid subuser IP pool strategy to improve deliverability. Reduce bounces, avoid spam traps, and maintain sender reputation with proven.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
