Delete message in mail box using OpenPop.NET

I am using OpenPop.NET client to get access to my mailbox via Pop3 protocol. All is fine, except one thing: I cannot delete messages. Even sample from official site doesn't help. I've tried it with several mail servers: gmail.com, yandex.ru, rambler.ru situation is the same. Update - added code. ``` static void Main(string[] args) { DeleteMessageOnServer("pop.gmail.com", 995, true, USERNAME, PASSWORD, 1); } public static void DeleteMessageOnServer(string hostname, int port, bool useSsl, string username, string password, int messageNumber) { // The client disconnects from the server when being disposed using (Pop3Client client = new Pop3Client()) { // Connect to the server client.Connect(hostname, port, useSsl); // Authenticate ourselves towards the server client.Authenticate(username, password); // Mark the message as deleted // Notice that it is only MARKED as deleted // POP3 requires you to "commit" the changes // which is done by sending a QUIT command to the server // You can also reset all marked messages, by sending a RSET command. client.DeleteMessage(messageNumber); // When a QUIT command is sent to the server, the connection between them are closed. // When the client is disposed, the QUIT command will be sent to the server // just as if you had called the Disconnect method yourself. } } ```