SmtpClient smtpClient = new SmtpClient("smtp.gmail.com");
smtpClient.Port = 587;
... etc

<system.net>
   <mailSettings>
     <smtp from="example@gmail.com" deliveryMethod="Network" >
       <network host="smtp.gmail.com" defaultCredentials="true"
                port="587" enableSsl="true" userName="example@gmail.com"
                password="example"/>
     </smtp>
   </mailSettings>
</system.net>

[HttpPost]
 public ActionResult SubmitFeature(FormData formData)
 {
     SmtpClient smtpClient = new SmtpClient();

     MailMessage mail = new MailMessage();
     mail.To.Add(new MailAddress("example@gmail.com"));
     mail.Body = "Test";

     smtpClient.Send(mail);

     return View("Example");
 }

<configuration>
  <system.net>
    <mailSettings>
      <smtp from="myEmail@gmail.com">
        <network host="smtp.gmail.com"
                 port="587"
                 enableSsl="true"
                 userName="myEmail@gmail.com"
                 password="SuperSecretPwd"
                 defaultCredentials="false" /> <!--This must be false on Gmail-->
      </smtp>
    </mailSettings>
  </system.net>
</configuration>

var smtpClient = new SmtpClient();
var msg = new MailMessage();
msg.To.Add("MyOtherAddress@yahoo.com");
msg.Subject = "Test";
msg.Body = "This is just a test email";
smtpClient.Send(msg);