How can I use a local SMTP server when developing on Windows 7? [closed]

If you are developing in ASP.net using the built-in mail libraries, a lesser-known configuration setting is to use the following:

<configuration>
. . . more config stuff here . . .     
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="SpecifiedPickupDirectory" from="noreply@testdomain.org">
        <specifiedPickupDirectory pickupDirectoryLocation="c:\smtp\"/>
      </smtp>
    </mailSettings>
  </system.net>
</configuration>

All your application generated emails will be dumped into this directory during development. No smtp server needed!