The Courier Blog

5 Best Platforms for Product Messages in 2026

Product messages are a requirement for every SaaS product, but most teams outgrow their initial setup fast. You start with one email provider, add push, then SMS, and suddenly you're maintaining multiple integrations with no shared routing, no preference management, and every copy change requires a deploy. This guide compares five platforms that solve different versions of this problem: Courier for cross-channel messaging with AI tooling, Resend for developer-friendly transactional email, Customer.io for marketing-adjacent journeys, Supabase for built-in auth emails, and Novu for open-source self-hosted infrastructure.

How to Send Notifications from an AI Agent with Courier's MCP Server

AI agents handle support tickets, monitor pipelines, run onboarding flows, and sync CRM data. When they do, someone needs to know what happened. Courier's MCP server gives agents direct access to the full notification API: send across email, push, SMS, Slack, and in-app. Check user preferences before sending. Trigger batch and digest Journeys so high-volume agents don't spam users. This guide covers MCP server setup, CLI tooling, Courier Skills for your IDE, and five real-world patterns with starter prompts.

Build with AI: let your agent handle notifications end to end

Courier's Build with AI toolkit gives coding agents direct access to your notification infrastructure. Four integration points, one goal: let your agent send messages, debug deliveries, manage users, and follow notification best practices without context-switching. Works with Claude Code, Cursor, and any agent that can run shell commands or call MCP tools.

How to Use Claude Code on Mobile to Design, Test, and Ship Multichannel Notifications

A walkthrough of using Claude Code's mobile app with Courier's MCP server and CLI to design, test, and ship a multichannel product announcement from a phone. Covers the full workflow: drafting the content outline, creating notification templates using Courier's elemental format, building channel-specific variants for email, Slack, push, and SMS, customizing brand styling through the API, iterating on design with test sends, getting team approval, and publishing with custom routing rules. The whole thing took a couple hours, mostly cold start and design iterations.

Fonts in email: what works, what breaks, and how to fix it

Email clients don't agree on fonts. Gmail strips your custom typeface, Outlook sometimes defaults to Times New Roman, and Apple Mail handles web fonts fine. This guide covers what the industry actually does: fallback-first font stacks, progressive enhancement, readability standards, and a pre-send QA workflow

Debug Delivery Issues in Your AI Editor with MCP

Between quarterly audits, delivery issues don’t wait. When emails fail or alerts fire, you need answers fast. Courier’s MCP server lets you debug notifications conversationally—find the message, trace its timeline, and inspect user data in minutes. Instead of jumping between dashboards, your AI agent pulls everything on demand, surfaces root causes, and even automates investigations. The result: faster fixes, less guesswork, and a smarter, always-on reliability workflow.

How to Build B2B Customer Journeys

Courier Journeys is an AI-native journey builder for multi-step customer messaging. Build on a visual canvas with branching, delays, live data fetching, AI nodes, and omnichannel sends. Define your payload schema so variables autocomplete throughout the flow. Branch on product events and profile data. Use AI to enrich profiles, drive branching logic, or generate personalized message copy. Throttle messages so customers aren't overwhelmed. Compare draft changes against the live version before publishing. Invoke and test from the CLI or MCP server. Scaffold growth patterns with Courier Skills.

Audit Notifications with Cursor or Claude Code

Most teams can't answer a basic question about their own product: what notifications are you sending, and are they working? This post walks through a full notification audit using Courier's CLI and MCP server from inside your coding environment. You'll inventory every template, pull delivery logs to surface failures, trace messages end to end, inspect rendered content for stale copy, map the data feeding each notification, break down delivery health by tenant, check preference coverage, and build a hit list of notifications to kill, revise, or batch. All from the command line. Takes about an afternoon.

Courier vs Customer.io: 2026 messaging platform comparison

Courier and Customer.io both send across multiple channels, but they're built for different jobs. Courier is a customer messaging platform for product teams: it turns the events and user data your app already produces into notifications across journeys, broadcasts, Inbox, preferences, and AI internationalization. Customer.io is built for marketers running profile-driven campaigns, segmentation, and A/B testing. This comparison covers pricing, workflows, in-app messaging, localization, and which one fits your use case.