I have an app that sends emails and I want to test it under high volumes of traffic (not because it needs to send high volumes of emails - because I'm debugging a problem that occurs rarely and is related to the sending of emails). I want to send emails from the app, but via a SMTP server local to my development PC (so I don't look like a spammer), and preferably to a local destination, so that I'm not using tons of internet traffic.
What's the best (free) way to do this (Win XP SP3)?