Release checklists often prove the API is up, the queue is draining, and the UI loads. Then an approval email ships with the wrong hostname, or a reset link points at yesterday's env. That gap is why I keep one small email check in the release path now. It is not fancy, but it saves a lot of avoidable thrash. I am not talking about a giant suite. I mean one replayable workflow for the email that matters most in that release: signup, approval, password reset, invite, whatever is user-visible a...