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
Fix cold email tools that only send HTML by verifying email lists, reducing bounces, and improving inbox placement with proven deliverability tactics and.
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Decide between dedicated and shared IPs for low-volume transactional emails. Reduce bounces, improve inbox placement, and avoid spam traps with verified.
Stop chasing inflated open rates from MPP proxy opens. Learn how email verification with MailTester restores reliability and improves deliverability.
Learn who reports you to Spamcop, how listings are triggered, and how to avoid them. Prevent spam traps and protect sender reputation with real-time.
Use Postfix transport_maps to enforce destination-specific rate limits. Reduce bounces, avoid blacklists, and improve deliverability with precise.
Ensure Korean characters in email content reach inboxes reliably. Learn how UTF-8 and EUC-KR encoding affect deliverability and how MailTester helps.
Learn how plain text emails impact primary tab placement and inbox deliverability. Improve your open rates with proven verification and list hygiene.
Learn how to implement VERP addresses in Postfix for precise bounce tracking. Reduce delivery failures, clean your list, and improve sender reputation.
Test email deliverability with swaks CLI — send real SMTP tests, diagnose bounces, and validate inbox placement. Run swaks examples in seconds.
Discover how reused SMS short links hurt email deliverability. Learn the real risks and how email verification can prevent inbox placement failures.
Understand why your Telus telus.net emails are blocked. Learn how filtering rules affect deliverability and how to fix it with real-time verification.
Compare Mailgun vs Amazon SES setup complexity for developers. Understand differences in API, DNS, and authentication.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
