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Opening a broker to browsers and devices on the internet is less about encryption than identity. Each entrance now accepts one kind of credential, every token is bound to its own name and addressed to this broker, and TLS ends in nginx.
SMTP and IMAP credentials fail late and far from their cause: a reset email that never arrives. A small check proves both directions first, with a tokenised test message, a read-only inbox check, and broken config kept distinct from a broken server.
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