mail.From="kehanpingcg@163.com";
mail.Subject="your password";
mail.Body="this is a test for mailsend";
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", ""); //set your username here
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", ""); //set your password here