forward method
Implementation
Future<Message> forward(String id, MessageForwardOptions options) async {
final url = Uri.parse('${baseUrl}api/messages/$id/forward');
final response = await client.post(url, body: jsonEncode(options));
if (response.statusCode != 200) {
throw MailosaurError(response);
}
return Message.fromJson(jsonDecode(response.body));
}