Sending emails from .NET to local folder

This is useful trick when you need to test email sending from your application without flooding your inbox.
It is enough to set up our mail settings in following way:

<configuration>
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="SpecifiedPickupDirectory">
        <specifiedPickupDirectory pickupDirectoryLocation="Dir"/>
      </smtp>
     </mailSettings>
  </system.net>
</configuration>