Notifications Landscape

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.

How to use subdomains to improve email deliverability

Mailbox providers score sender reputation per sending domain, so one bad campaign can take your password resets with it. Here's how to split your email streams across subdomains, and what that does and doesn't protect you from.

Slack & Microsoft Teams: Notifications Have Entered the Chat

Right message, right time, right place. Your users juggle email, Slack, Teams, and mobile but context matters. Product teams are using intelligent routing so urgent alerts land in active channels. Courier makes this easy with time and context-aware routing and behavioral triggers.

How Notification Infrastructure Improves Health Outcomes

In the evolving digital health landscape, reliable notifications are key to continuity of care and patient-provider trust. From appointment reminders to real-time alerts, discover how Courier's API empowers healthcare innovations with secure, scalable communication.

Twilio Notify EOL: Why Twilio Chose Courier (And Why You Should Too)

Twilio Notify reaches end-of-life on December 31, 2025, leaving users with a choice to make about alternatives. Twilio itself has transitioned to Courier, recognizing it as the superior solution for multi-channel messaging and advanced notification management. Here’s why Courier stands out as the best alternative, and how you can smoothly migrate your notifications without disruption using our detailed, step-by-step migration guide.

Why Workforce Platforms Need Multi-Channel Notifications

Email isn’t enough. Today’s workforce is distributed, mobile, and diverse. Learn how multi-channel notifications help you reach every worker, on every channel.

The Modern Embedded Editor: Why SaaS Needs More Than Email

Embedded email editors only solve part of the problem. Courier Create gives SaaS platforms a complete solution — multi-channel design, integrated delivery, and per-tenant control — all right inside your app.

Data Residency for Notification Infrastructure: Complete Compliance Guide

Data residency isn’t just a legal checkbox. It’s a foundation for secure, performant, and compliant notifications. Learn how Courier helps teams meet regional data laws like GDPR, HIPAA, and Japan’s APPI with regional infrastructure in the US and EU.

How Multichannel Notifications Reduce SaaS Churn and Boost Engagement

Keeping SaaS users engaged is key to reducing churn. Multichannel notifications—via email, SMS, push, Slack, and more—help re-engage dormant users, guide them through onboarding, and highlight key features. The right message, delivered at the right time, ensures users stay active and see the value of your product.