What we have learned about getting email delivered.
Practical articles from the Notix team on email deliverability, transactional email, SMS, one-time codes and API design, with checklists you can use.
Transactional vs. Marketing Email: One Test for Business Email Teams
Apply the primary purpose test, then route transactional and marketing email through separate paths on one platform with shared suppression lists.
List Hygiene: Catch Bad Emails at Signup for Small Businesses
Protect email deliverability with a list hygiene checklist that prevents bad signups, tracks bounce and complaint thresholds, and automates routine cleanup.
Bounce Reason Codes: Check the DSN Before Retrying a 4xx
Learn how 4xx and 5xx replies shape retry or suppression decisions, which DSN fields to inspect, and how SMTP transcripts reveal why email bounced.
Ship 429 & RateLimit Headers First: API Rate Limiting for Engineers
Implementation first API rate limiting for engineers. Map algorithms to burst, memory, and latency. Ship 429/RateLimit headers and load test.
Stop Trusting 'Sent': SMS Deliverability for Marketers & Engineers
Stop trusting 'sent.' Measure SMS deliverability with DLRs, diagnose failures, and apply prioritized fixes for marketing and engineering teams.
Avoid Throttling: IP Warming for Deliverability Teams with 1.5x Ramps
Operations-first IP warming for deliverability teams. Use 1.5x stage increases with 2–4 day holds, monitor 0.1% complaints and ~2% bounces.
4 Technical Fixes to Improve Email Deliverability for Marketers & Devs
A practical, engineering-aware checklist for marketers and devs: configure SPF/DKIM/DMARC, enforce double opt-in, warm up sends.
Avoid Fines, Prove Consent: Email GDPR Operations for Marketers
Operational guide that turns GDPR rules into an eight item checklist so marketers can prove consent, automate suppression, and avoid fines.
9 Step SMTP Relay Checklist for IT Teams with Postfix Snippets
Practical SMTP relay setup for IT teams: copy paste Postfix configs, Microsoft 365 and Google relay steps, abuse hardening, and a 9 step checklist.
4 Templates and Safe Webhooks: Payment Receipt Emails for Dev Teams
Get four ready-to-send receipt templates plus webhook safe delivery patterns, idempotency guidance, and resend best practices for dev and ops teams.
Integrate SMS API in an Afternoon for Devs: Secure OTPs & Email+SMS
Developer playbook to integrate an SMS API from credentials to delivery. Secure OTP alternatives, webhook testing, and a unified email+SMS example.
Email API Pricing for Developers: Why $0.10/1,000 Isn't Your True Cost
Developer playbook to email API pricing. See why the $0.10/1,000 headline misleads, which add-ons raise your bill, and how Notix reduces hidden costs.
3 Password Reset Email Templates for Devs and PMs, OWASP Aligned
Three ready password reset email templates for developers and PMs, with an OWASP-aligned engineering checklist and fixes for common deliverability problems.
Developers and Procurement Teams: Estimate SMS API Cost in 6 Steps
Estimate your SMS API cost with a six-step checklist for developers and procurement teams, covering message segments, number rentals and carrier surcharges.
1M Notifications in 5 Minutes: Notification Architecture for Engineers
Notification architecture for engineers sending a million notifications in five minutes: Kafka versus SNS and SQS, Redis SETNX idempotency, render at ingest.
4 SMS Scheduling Methods for Business Owners to Prevent Blocked Sends
Four practical ways businesses schedule SMS, and how to avoid blocked or deferred deliveries with timezone handling and quiet-hour checks.
5–15 Minute TTL Email OTP for Developers: NIST and OWASP Aligned
Standards-backed email OTP verification for developers: secure token logic, single-use codes, 5–15 minute TTLs, rate limiting and deliverability of the code.
Prevent Inbox Drops in 2–3 Weeks: Email Campaign Management for Ops
Operations-first email playbook: prioritize deliverability with pre send gates and strict list hygiene to keep mail in inboxes.
4–12 Weeks to Register SMS Sender IDs: Regulator Rules for Ops & Eng
A regulator-first guide for ops and engineering to SMS sender ID rules from ACMA, ComReg and Ofcom, and the 4–12 week provisioning windows to plan around.
Developers: 6 Rules for Secure Email Verification Links
A developer explainer of email verification links: how single-use tokens work, six rules for secure links, troubleshooting, and sending them with Notix.
3 Order Confirmation Email Checks for Marketing & Dev Teams
Marketing and Dev playbook for order confirmation emails: 3 operational checks plus copy and deliverability steps to cut support tickets.
Email Teams: Don't Buy a Dedicated IP If You Send a Few Thousand a Day
Decide if a dedicated sending IP fits your email team. Confirm the real egress IP, follow a warm-up checklist, monitor reputation, or use Notix to cut ops.
Recover Failed Payments: Idempotent Dunning Emails with a 4–5 Cadence
Recover failed payments with dunning emails: a 4–5 email cadence, branching on decline codes, idempotent state machines and testing it all in a sandbox.
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