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 with proven DKIM alignment strategies for multi-tenant platforms. Verify domains, fix mismatches, and prevent inbox filtering.
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Learn whether spam trap checkers verify domain reputation. See how MailTester’s email verification detects invalid, risky, and trapped domains—without.
Fix the SPF mechanism typo with 'a' instead of 'mx' that triggers false positives. Learn how MailTester detects and prevents deliverability issues before.
Find the best email verification software with role account suppression to reduce bounces, improve deliverability, and clean your list.
Understand how email gateway relaying affects DKIM signature validity and reduce deliverability issues. Verify your lists with confidence.
Understand how SPF softfail impacts inbox placement in 2026. Learn why it’s not a death sentence, how modern receivers handle it, and how to test your.
Stop missing bounce failures due to sampling. Learn how to verify every address, prevent wasted sends, and ensure deliverability with real-time validation.
Find email verification services that support embedded signature attachments. Improve deliverability and sender reputation with accurate, real-time.
Optimize your email verification cadence to prevent blacklisting during live campaigns. Reduce bounces, protect sender reputation, and ensure inbox.
Stop emails from vanishing after switching ESPs. Diagnose and fix deliverability issues with real-time verification and inbox testing—before you lose.
Learn how ESPs vet senders in shared IP pools and why list hygiene impacts deliverability. Verify email lists with 98.9% accuracy.
Fix Klaviyo spam score issues fast. Test these 7 key factors first—sender reputation, list hygiene, DNS records, and more.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
