Why a local SMTP catcher is not an email integration test

<p>Your Playwright test fills the signup form. The app sends the confirmation email. Mailpit shows the message with the right subject and link. The test passes.</p> <p>Then staging sends the same email to a real address and nothing arrives.</p> <p>The local catcher did its job. It proved the app opened an SMTP connection, built a MIME message, and rendered the template. It did not prove the messag

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