Engineering

Nodemailer Alternative: Outgrowing DIY Email Infrastructure

Nodemailer works great for transactional email in early-stage products. But B2B customer journeys demand more: Slack notifications for engineering teams, Microsoft Teams messages for enterprise customers, in-app notification centers, SMS escalations, and push alerts. Building this yourself means maintaining integrations with SendGrid, Twilio, Firebase, Slack's API, and Microsoft Graph. Courier provides omnichannel notification infrastructure through one API, handling routing, preferences, delivery, and analytics across every channel.

How to migrate AppDelegate to UISceneDelegate (iOS 26 Requirement)

Apple is enforcing the UIScene lifecycle in iOS 27 — and it directly affects push notifications. In iOS 26, simulators began warning about missing scene support. Here’s what’s changing, what errors to expect, and how to update your app to keep push notifications working.

What is the Twilio Messaging API?

Twilio's Messaging API enables developers to send and receive SMS, MMS, WhatsApp, and RCS messages at scale across 180+ countries. While Twilio excels at reliable message delivery through carrier networks, modern applications need more than single-channel messaging. Courier acts as a provider-agnostic orchestration layer that activates messaging across Twilio and other channels from a single platform. You get intelligent routing, user preference management, and fallback logic without vendor lock-in.

What Most People Get Wrong About Push Notification Metrics

Push notification analytics have evolved beyond traditional engagement metrics, yet many teams still rely on outdated measurement approaches that obscure real business value. The challenge lies in applying email marketing metrics to push notifications without considering fundamental differences in user behavior and platform constraints. A notification that never gets "opened" might still drive a purchase decision or prevent user churn.

How to Embed a Template Designer into Your React Application

Multi-tenant SaaS platforms struggle with giving customers template design control without compromising security. Courier Create solves this with an embeddable React component that provides drag-and-drop editing, variable substitution, and brand customization while maintaining tenant isolation. Learn how companies like Side and Hipages benefit from customer-controlled templates, plus get setup code examples for React 18.2+ integration.

Video Guide: Courier MCP + AI Coding (Cursor)

Building notifications into your app just got dramatically easier. Courier's new MCP server brings AI-powered notification assistance directly to your IDE, so you can integrate, test, and manage notifications without ever leaving your workspace. Model Context Protocol servers give AI agents deterministic functionality instead of guessing. Connect your AI assistant directly to Courier's platform, get smart installation guidance, send messages with natural language, and manage users safely—all through Cursor, Claude Code, VS Code, and more.

Best Push Notification Services: A Complete Comparison

Push notifications are critical for modern user engagement. In this guide, we compare the best push notification platforms, from legacy tools like Airship and Firebase to modern APIs like Courier, covering features, pricing, and developer experience.

Why You Need Multi-Tenant Infrastructure for Notifications

Need to send notifications for many customers without mixing data or losing brand identity? This practical guide walks you through mapping a tenant hierarchy, carrying context in every call, setting up layered preferences, and adding dynamic branding. It pairs code samples with checklists so you can choose to build from scratch or plug in Courier when you are ready to scale

How to Send an SMS in Java

Send an SMS in Java using the Courier SDK with your existing Twilio account as the provider. Complete working code, step-by-step setup, and a direct Twilio comparison for when the orchestration layer is overkill.