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 how to properly configure CNAME DNS records for DKIM delegation to external senders. Avoid deliverability issues with accurate, actionable steps.
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Stop dead emails from wrecking your sender reputation. Learn how bounce suppression sharing across ESPs works, why it matters, and how MailTester helps.
If your DMARC aggregate reports aren’t arriving, diagnose and fix RUA mailto issues. Validate your record, check DNS, and ensure inbox delivery with.
Detect machine-generated email bursts in real time with automated verification. Prevent blacklisting and improve deliverability using live traffic.
Ensure your election campaign emails land in inboxes by verifying sender status. Use real-time verification and deliverability testing to reduce bounces.
Run automated inbox placement testing as part of your CI regression suite. Catch deliverability risks before they hit production.
Avoid engagement drops with a proven cold email domain rotation cadence. Verify domains, test inbox placement, and maintain sender reputation with.
Discover how automated detection of fake domains used in email spoofing campaigns protects inboxes and improves deliverability.
Ensure your email campaigns comply with Japan's Act on Regulation of Transmission of Specified Electronic Mail.
Stop losing valid leads to false positives. Learn how to identify and fix email verification errors that block outbound mail—accurately and at scale with.
Compare cold email reply rates across Google Workspace and Microsoft 365. Use real inbox placement data and verification to boost response rates.
Learn how to implement SRS for SMTP forwarders to prevent email rejection. Use MailTester’s verification tools to validate your setup and ensure inbox.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
