Release 0.7.3

.env.example

@@ -6,6 +6,7 @@ BODY_SIZE_LIMIT=6M
 
 # Generate this locally and insert it here as described in README.md. Never commit .env.
 SENDEWERK_SETUP_TOKEN=
+# Public production origins must use HTTPS; loopback HTTP remains available locally.
 SENDEWERK_APP_ORIGIN=http://localhost:5173
 
 # "local" writes messages to the outbox and never contacts a mail server.