Guide

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.

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.

Best Practices for SMS Tools and Text Message API Implementation

Courier delivers easy access to the messaging providers you use, all in a familiar language and with documentation that’s comprehensive and easy to follow. This page will give you an overview of the SMS providers supported by Courier’s text messaging API, so that you can assess if moving towards a messaging management tool is right for you.

How to Use a Push API to Send Notifications from your Mobile App

This article dives into the topic of push notifications and explains how to use Courier’s push API to deliver simple, one-time push notifications to Android or iOS systems.

How to Choose the Right SMS API for Your Project

In this article, we explain how to choose the right SMS API provider for your needs. We also cover how using Courier can help save a lot of the headache of deciding on a provider, as well as how it offers extra functionality to enhance your SMS sending strategy.

Top 7 Push Notification APIs

Push notifications are a great way to keep users engaged with a product. Used properly, they can significantly increase your click-through rate compared to an email blast. Read our comparison which considers 7 of the top providers against the following set of factors: API documentation/SDK: how easily the service integrates with your code, how accurate the documentation is, and whether the service supports all mobile languages Features: what the main service features are and whether it has common features for notification APIs Price: what the cheapest plan is, what exactly it covers, and how the pricing scales

How to Send Android Push Notifications with Firebase Cloud Messaging and Courier

Learn how to send Android push notifications using Firebase Cloud Messaging (FCM) and the Courier SDK to simplify setup, manage tokens, and deliver messages reliably.

A Developer’s Guide to Notification APIs

A notification API is a combination of backend infrastructure and both server- and client-side SDKs that enable developers to build notifications in web and mobile apps. In this guide, we delve deeper into notification APIs, their role in transactional and marketing notifications, practical use cases, and the indirect benefits they offer.

Transactional Emails Demystified: From Selecting Providers to Delivery Best Practices

This article explains transactional email, compares email service providers, and presents best practices for implementing and managing transactional email.