Test Courier emails end to end with your AI agent

Courier’s proposed end-to-end email testing workflow uses an AI coding agent, Courier’s Test environment, AgentMail inboxes, and Device Preview screenshots to send real template variants, inspect delivered messages, and identify issues before release. It recommends scripting objective checks for subjects, variables, links, authentication records, delivery status, and unexpected content, while having an agent review copy, visual rendering, dark mode, mobile layouts, and other subjective concerns that require human sign-off. The process tests normal, missing-field, and long-value data, stores approved expectations and artifacts, prevents production publishing, and reruns after fixes until all checks and reviews pass. Examples show the approach detecting staging links, blank greetings, misplaced transactional copy, incomplete delivery-date text, and misleading button labels, including defects that automated checks alone missed. The post also outlines setup, debugging delivery failures, CI integration, and the distinction between real-inbox testing and sandbox testing, emphasizing that live sends can validate providers, routing, DNS authentication, and the final user-facing email.

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