Problem In sending Mail from the server

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ASP.NET

server

web-hosting

Hi
I have hosted an application on the server called ParallelsPlesk Panel when i am sending mail from the application which is hosted i am receiving this error
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at

Username and password is correct is correct


But when i run the application on my local pc it is running properly mail are being sent
can anyone tell what might be the problem


//This is the mail code
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();//instantiate mail message
SmtpClient smtp = new SmtpClient();
mail.To.Add("surajfg@gmail.com");
mail.From = new MailAddress("isptestmail@gmail.com");
mail.Subject = "Subject";
mail.IsBodyHtml = true;
mail.Body = "Message";
smtp.Host = "smtp.gmail.com";

smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
smtp.Credentials = new System.Net.NetworkCredential("isptestmail@gmail.com", "Secret");
smtp.EnableSsl = true;

smtp.Send(mail);