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.
Deliverability testing tools compared: alternatives and reviews
Compare Postmark and Mailgun for password resets and OTP emails. See real-world performance, latency, and deliverability impact — plus how MailTester.
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Learn how to automatically process JMRP complaint emails, parse ARF reports, and unsubscribe users in real time.
Set up AOL DNS records for reliable bulk email verification. Ensure accurate deliverability testing and list hygiene with real-time email validation.
Learn how to set a custom return-path domain in your ESP to improve deliverability and sender reputation.
Use this proven 14-day rewarm schedule template to rebuild sender reputation and land emails in inboxes.
Understand what a Microsoft SNDS complaint rate below 0.1% means for your sender reputation. Learn how to verify and maintain inbox placement with real.
Understand why ARF reports redact recipient addresses. Learn how this protects privacy, complies with regulations, and impacts email deliverability.
Fix Outlook deferrals 421 RP-001 during email warm-up. Learn to safely scale 10K daily sends with real delivery testing and list hygiene.
Improve Gmail delivery rates by verifying email addresses before sending. Reduce bounces, avoid spam traps, and boost inbox placement with accurate.
Stop iCloud Mail delivery blocks with proven sender authentication. Verify your list and test inbox placement with real-time email verification and.
Learn how to set up Amazon SES BYOIP for better deliverability. Verify your list, test inbox placement, and avoid spam traps with MailTester’s 98.9%.
Compare Postmark vs Mailgun pricing at 100k transactional emails. See how delivery costs scale, what’s included, and why list hygiene matters.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
