How to read system.net/mailSettings/smtp from Web.config

Question

This is my web.config mail settings:

Answer 1

Since no answer has been accepted, and none of the others worked for me:

using System.Configuration;
using System.Net.Configuration;
// snip...
var smtpSection = (SmtpSection)ConfigurationManager.GetSection("system.net/mailSettings/smtp");
string username = smtpSection.Network.UserName;