Keep email runtime configuration out of Vault

infra/local/scripts/common.sh

@@ -57,7 +57,7 @@ ensure() (
 # Never forward mongosh errors: authentication/command errors may include secrets.
 mongo() { compose exec -T mongo mongosh --quiet --file /dev/stdin > "$WORK/mongo-result" 2> "$WORK/mongo-error" || return 1; cat "$WORK/mongo-result"; }
 admin_auth() { kv infrastructure/mongo/bootstrap | jq -r '"const admin=db.getSiblingDB(\"admin\"); admin.auth(\"local-admin\","+(.password|tojson)+");"'; }
-email_valid() { jq -e '(.api_key|type=="string") and (.api_key|test("\\S")) and (.sender_address|type=="string") and (.sender_address|test("\\S")) and .sender_address!="notifications@localhost.test"' >/dev/null; }
+email_valid() { jq -e '(.api_key|type=="string") and (.api_key|test("\\S"))' >/dev/null; }
 export_ca() {
  compose exec -T frontend cat /data/caddy/pki/authorities/local/root.crt | write "$STATE/ca.pem" 644
 }