MAIL_SCHEME=smtp is Symfony's opportunistic scheme (upgrade to STARTTLS if offered, don't fail if not) — not a "no encryption" statement. Mapping it to 'none' silently turned every existing MAIL_SCHEME=smtp installation's encrypted-when-possible connection into an always- plaintext one. Maps to 'tls' (STARTTLS required) instead: stricter than smtp's own default, so a relay lacking STARTTLS now fails loudly rather than leaking credentials. |
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