Email Deliverability Provider Comparison: API Domain Verification Without SMTP Relay
Short answer: for a beginner SaaS sending marketplace order notifications, an API-first email provider is viable when it offers domain verification,…
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Healthtech Welcome Email — 4 API Signals Before Raising Dedicated-Domain Volume
The hard part of a healthtech signup email isn't calling a send API. It's proving that a dedicated domain is ready for more welcome-email traffic wi…
Custom Domain Verification, DKIM Rotation, and Suppression for Transactional Email APIs
Short answer: Choose a transactional email API only after its custom domain verification, DKIM rotation, suppression export, event history, and roll…
Transactional Email Warmup Explained — 5 Steps for Deliverability and Volume Ramping
Short answer: use a dedicated sending domain, let real transactional demand set the pace of a gradual ramp, and make every receipt request idempoten…
Keeping your email deliverability high by filtering invalid emails
Keeping data consistent, compliant and true is pretty hard nowadays. We are aware of legacy code and tech debt problems, but rarely concern ourselve…
You fixed SPF, DKIM and DMARC and email still lands in spam. Here's why.
Last post I got the auth records green on my side-project mail. SPF, DKIM, DMARC all passing, and I figured the hard part was behind me. It wasn't.…
The State of Email in 2026: what 50,000 domains reveal about MX, SPF & DMARC
By the team at MailTester Ninja — a real-time email verification API that stores nothing. We verify a lot of email for a living. So we pointed our i…
How email verification works: syntax, MX, and SMTP explained
"Email verification" sounds like one thing, but it's really a stack of checks of increasing depth and cost. Knowing what each layer actually proves…
IP Warmup for New Mail Servers: Complete 2026 Guide
You just deployed your new KumoMTA or PowerMTA server. You have clean IPs, perfect DNS, and a million emails queued to send. Stop. If you send that…
Bounce Rate Reduction: The Complete Technical Guide
Bounce rate is the silent killer of email deliverability. A rate above 2% gets you flagged. Above 5% gets you blocked. Most teams don't know they ha…
KumoMTA Setup Guide: From Zero to Production Email
KumoMTA's combination of open-source licensing and modern architecture makes it an attractive choice for teams ready to move beyond legacy MTA solut…