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
Learn when DKIM alignment alone satisfies DMARC policies and why SPF can't align. Improve inbox placement with MailTester’s verification tools.
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Discover legitimate ways to use BIMI without a registered trademark. Learn real alternatives for brand verification and inbox recognition in 2026 with.
Optimize inbox placement with multi-region email sending for global deliverability. Reduce bounces, improve sender reputation, and test real-world inbox.
Learn what a deferral in email delivery means, why it happens, and how to fix it. Reduce bounces and improve inbox placement with real-time verification.
Navigate Germany's UWG cold email laws and double opt-in requirements in 2026. Verify email lists, avoid legal risk, and ensure deliverability with.
Resolve inbox placement issues after ESP migration with precise email verification. Prevent spam filters, reduce bounces, and boost deliverability with.
Clean your email list quarterly with this actionable checklist. Reduce bounces, improve deliverability, and protect sender reputation using real-time.
Learn the exact Outlook email attachment size limit and file upload restrictions. Avoid delivery failures with actionable guidance on file size, types.
Stop wasting sends on shared mailboxes and role accounts. Use MailTester’s 98.9% accurate email verification to clean your list and boost deliverability.
Stop delivery failures caused by header injection. Learn how to secure your emails, improve inbox placement, and maintain sender reputation with proven.
Learn how to submit a Yandex Mail delisting request for a blocked sending IP. Step-by-step guide to unblock your IP and restore deliverability on Yandex.
Ensure your newsletter lands in inboxes—not spam. Test deliverability, fix sender reputation issues, and verify domains with MailTester’s real-time tools.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
