How to develop and test an app that sends emails (without filling someone’s mailbox with test data)? [closed]

I faced the same problem a few weeks ago and wrote this: http://smtp4dev.codeplex.com

Windows 7/Vista/XP/2003/2010 compatible dummy SMTP server. Sits in the system tray and does not deliver the received messages. The received messages can be quickly viewed, saved and the source/structure inspected. Useful for testing/debugging software that generates email.