The Courier Blog

When AI Needs to Talk

AI agents are transforming work by operating autonomously around the clock, but they're creating unexpected communication challenges. When MIT's AI discovered the antibiotic halicin, it sat unreviewed for months. As agents generate insights faster than humans can process them, teams face notification fatigue and approval bottlenecks. The solution isn't smarter agents—it's better infrastructure for agent-human communication that can route intelligently and maintain context.

Video Tutorial: Getting Started with the New Courier Inbox for React

See how easy it is to add real-time in-app notifications to your React app with the new Courier Inbox for Web. Watch the demo and start building in minutes.

The New Courier Inbox for Web — Faster, More Flexible In-App Notifications

Courier Inbox for Web has been rebuilt for speed, flexibility, and easy integration. Add real-time in-app notifications to your app in minutes with full UI control.

Top 7 Push Notification Providers in 2025

Push notifications drive real-time engagement, but managing multiple providers creates integration complexity. Courier is provider-agnostic orchestration layer for Push, Email, SMS, In-App, and Chat. We evaluated 7 top push services—FCM for universal coverage, APNS for iOS reliability, MagicBell for in-app centers, plus Airship, Pusher Beams, Expo, and AWS SNS. Most apps need multiple providers like FCM + APNS + MagicBell. Instead of custom integrations, use notification orchestration for automatic failover and unified management across email, SMS, and chat channels.

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.

Top 6 Email Service Providers for Transactional Notifications in 2025

Comprehensive guide to the 6 best email service providers for transactional notifications in 2025. Compare SendGrid for high-volume enterprise delivery, Mailgun for developer APIs and routing control, Resend for React-based templates, AWS SES at $0.10/1000 emails for cost efficiency, Postmark with <2 second delivery for critical notifications, and SMTP for universal compatibility. Learn why most teams need multiple ESPs, how to meet new SPF/DKIM/DMARC requirements for Gmail, Yahoo, and Outlook.

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 Use Sub-Domains to Improve Email Deliverability in 2025

Email deliverability is harder than ever in 2025. This guide shows how using sub-domains can improve inbox placement and protect your most important messages.

Courier + Segment: A Guide to Event-Driven Messaging

Courier's native, bidirectional Twilio Segment connection enables real-time event-driven messaging with engagement feedback loops. Trigger multi-channel notifications (email, SMS, push, in-app) from Segment track events like "Trial Started" or "Feature Used." Courier sends engagement data back to Segment for behavioral analytics. Build automated workflows with drag-and-drop editor, conditional logic, and channel fallbacks. Supports SendGrid, Twilio, and native Inbox components for comprehensive notification orchestration.