Both variables exist in .env.self-host.example but were missing from the
user-facing env vars reference, so self-hosters had to read the example file's
inline comments to discover them.
- MAIL_FROM_SUBDOMAIN: added a row to the AWS SES section explaining how the
prefix combines with a verified domain to construct the MAIL FROM hostname,
and when to override the default.
- NGINX_PORT: added a new "Advanced" section for variables that almost never
need tuning, with the host-port override use-case spelled out.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
