小编sum*_*mit的帖子

我正在使用outloook 2003和visual studio 2008.我想开发一个将电子邮件发送到任何域的应用程序.但是当我尝试向gmail,hotmail等发送电子邮件时,我的代码失败了,实际上所有的消息都存储在C:\Inetpub\mailroot\Queue目录中.请帮我如何将电子邮件发送到gmail,hotmail a/c.

提前致谢

代码是

System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
message.To.Add("sumitdawar@hotmail.com");
message.To.Add("sumitdawar@gmail.com");            
message.Subject = "This is sample mail";
message.From = new System.Net.Mail.MailAddress("Sumit.Dhingra@niit.com");
message.Body = "this is the message body";


System.Net.Mail.SmtpClient sss = new System.Net.Mail.SmtpClient("HO-KKJ-MAIL.in.niit.com");
sss.UseDefaultCredentials = false;
sss.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;
sss.Credentials = new System.Net.NetworkCredential("Sumit.Dhingrar", "password","domain");