Insert the following into your web.config file:

<configuration>
  <system.net>
    <mailSettings>
      <smtp from="email@yourdomain.com">
        <network host="mail.yourdomain.com" 
                 port="25" 
                 userName="email@yourdomain.com" 
                 password="youremailpassword" />
      </smtp>
    </mailSettings>
  </system.net>
</configuration>
    

Replace the blue placeholders with your actual domain and email account details:

• from: The email address that will appear as the sender.
• host: Your mail server (e.g., mail.yourdomain.com).
• port: Typically 25, but may be 587 or 465 depending on your provider.
• userName: Your full email address.
• password: The password for your email account.

Once configured, you can send emails using the SmtpClient class in your ASP.NET code:

using System.Net.Mail;

MailMessage mail = new MailMessage();
mail.To.Add("recipient@domain.com");
mail.From = new MailAddress("email@yourdomain.com");
mail.Subject = "Website Enquiry";
mail.Body = "This is a test enquiry form email.";

SmtpClient smtp = new SmtpClient();
smtp.Send(mail);
    

The SmtpClient will automatically use the settings defined in web.config.

• Use authenticated SMTP (username + password) for reliable delivery.
• Check with your hosting provider if SSL/TLS is required (ports 587 or 465).
• Keep your web.config secure — do not expose passwords in public repositories.
• Test your configuration with a simple enquiry form before deploying live.