The SMTP SSL/TLS toggle in the add-account form now defaults to on with port 465. Previously the default was port 587 with the toggle off (STARTTLS — TLS was active under the hood, but the off toggle made users think the connection was insecure). The MX-record fallback in the discovery service was flipped the same way; autoconfig XML parsing is unchanged so servers that advertise STARTTLS still get STARTTLS. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>