How to send anonymous email? and how to check if the server block the sending?

I try to send some emails from Gmail server and if i send over 100 its block the sending the the software collapse..

And how to send it anonymous? its now work me, what im trying..


Im using System.Net, System.Net.Mail..... in brief

Code:

SmtpClient MailClient = new SmtpClient("smtp.gmail.com", 25);
MailClient.EnableSsl = true;
MailClient.Credentials = new NetworkCredential(user, password);
Msg.From = new MailAddress("anonymous@gmail.com");
Msg.To.Add(new MailAddress(TheMailThatGotTheMsg));
Msg.Subject = "Subject";
Msg.Body = "Body";
MailClient.Send(Msg);

so how i can check it? and to send it anonymously? :undecided