System.Net.Mail.MailMessage oMailMessage = new System.Net.Mail.MailMessage();
string MailReplyTo ="reply2Himanshu@gmail.com";
oMailMessage.To.Add("himanshu.joshi@yahoo.com");
oMailMessage.From = new System.Net.Mail.MailAddress("jo.him@gmail.com");
oMailMessage.Subject = "test";
oMailMessage.Body = "Hi this is test Mail";
oMailMessage.ReplyToList.Add(MailReplyTo);
oMailMessage.Headers.Add("reply-To", MailReplyTo);
SmtpClient client = new SmtpClient("MyServer", 25);
client.Credentials = new NetworkCredential("jo.him@gmail.com", "joPassword");
client.Send(oMailMessage);
happy coding :) :) :)