Welcome Email Deliverability Problems in Transactional Onboarding and Bounce Handling
For a property-management contact form, keep queue routing and delayed welcome logic in the application, then use a transactional email provider for…
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Transactional Welcome Email Explained: Custom Domains and Template Ownership
Send transactional email from a dedicated subdomain, authenticate it with SPF and DKIM, publish a DMARC policy, and keep the template contract in th…
The Hidden Costs of Disposable Emails (And How Blocking Them Saves You Thousands)
From CRM contact-tier inflation to free-trial credit farming and burned domain reputation—here is the real cost of disposable emails and how a free…
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…
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…