Часто при подключении к POP3, IMAP, возникают такие ошибки: Microsoft.Exchange.Monitoring.ProtocolException: Authentication failed. The connection is being closed. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.Server response while making connection:[]. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException:...