One of GMail's handier features that people are still surprised to learn about is the ability to make multiple, unique address aliases on the fly.
This is often touted as a handy filtering device within GMail, but I've come to rely on it during Drupal development. It's ideal for creating throw away e-mail addresses that I can use for user registration. This way,
- You don't have to maintain umpteen separate e-mail accounts for testing.
- You don't have to keep going back and deleting accounts to reuse a single address.
- All of those system welcome e-mail addresses go to one place.