getMessage method

@override String? getMessage(String mailbox, String uid)

Optional helper to get message content by UID

Implementation

@override
String? getMessage(String mailbox, String uid) {
  final messages = _store[mailbox];
  if (messages == null) return null;
  final index = int.tryParse(uid);
  if (index == null || index < 0 || index >= messages.length) return null;
  return messages[index];
}