I am unable to send the mail using smtp client. here is the code:

SmtpClient client=new SmtpClient("Host"); client.Credentials=new NetworkCredential("username", "password"); MailMessage mailMessage = new MailMessage(); mailMessage.from="sender@gmail.com"; mailMessage.To.Add("recipient@gmail.com"); mailMessage.body="body"; mailMessage.subject="subject"; client.Send(mailMessage);

The problem is that when I use this code in ASP.NET application, I do not recieve any mails. When in asp.net I change the from mail address to username given in NetworkCredential, I recieve mails.

But in C# windows application, I can get emails, even if sender's email address is not valid.

Thanks in advance....