This plugin will send all email that goes through the Elgg email handling system to a single address. (Note: it will not effect email that bypasses the Elgg email system such as the invite friends plugin).

Why do this?

If you are running a production site, you are probably mirroring the data to a testing server. You use this server to test new plugins and upgrades of the Elgg core. You mirror the data to test on as close to the real thing as possible. But you don't want your testing to create lots of emails to the actual users. This solves that problem.