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A password reset email is part of your login flow. An invoice notification is part of your billing experience. Yet development teams often treat these messages as background tasks: render a template, call a sending API, and move on. That approach leaves an important part of the product experience untested until a user cannot complete the action they started.

Testing the application interface alone leaves a gap. A successful request to an email provider does not establish that the recipient can find the message, understand it, or use its links.…