mail sending

You are trying to have this feature from quite some time now.

It can be because of various reasons. You need to look at them one by one.
Is the port open? Firewall permissions in place?
Further make sure you have configured SMTP configuration in Web.Config:

<system.net>
   <mailSettings>
     <smtp from="abc@somedomain.com">
       <network host="somesmtpserver" port="25" userName="name" password="pass" defaultCredentials="true" />
     </smtp>
   </mailSettings>
</system.net>

If needed, have a look at this Microsoft Video tutorial:
Use ASP.NET to send Email from Website[^]

public bool SendEmail(string senderEmail, string receiverEmail, string subject, string body)
{
try
{
//MailAddress emailto = senderEmail;
MailAddress emailto = new MailAddress(receiverEmail);
//MailAddress emailfrom = receiverEmail;
MailAddress emailfrom = new MailAddress(senderEmail);
MailMessage mail = new MailMessage(senderEmail, receiverEmail);
mail.Subject = subject;

mail.Body = body;
mail.IsBodyHtml = true;
NetworkCredential basicCredential = new NetworkCredential("UserName", "Password");
SmtpClient objSmtpClient = new SmtpClient(HostAddress,PortNo);

objSmtpClient.Credentials = basicCredential;



objSmtpClient.Send(mail);
}
catch
{
return false;
}
return true;
}

stop firewall access protection

try this:wish u it will help.



try
{
SmtpClient clientConnectionWithGmailSmtp = new SmtpClient("smtp.gmail.com");//it connect user with gmail smtp server
MailMessage mailMessage = new MailMessage();
mailMessage.From =new MailAddress(from@yahoo.com);
mailMessage.To.Add(to@yahoo.com);
mailMessage.Priority = MailPriority.High;
mailMessage.Subject = subjectTB.Text;
mailMessage.Body = messageBodyTB.Text;
if (textBox1.Text != string.Empty)
{
Attachment attachment = new Attachment(textBox1.Text);
mailMessage.Attachments.Add(attachment);
}

clientConnectionWithGmailSmtp.Port = 587;
clientConnectionWithGmailSmtp.Credentials = new System.Net.NetworkCredential("sendmailthroughc@gmail.com", "Chooseapassword");
clientConnectionWithGmailSmtp.EnableSsl = true;

clientConnectionWithGmailSmtp.Send(mailMessage);
MessageBox.Show("mail Send");
}