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.

If your GMail address is example@gmail.com, emails sent to example+user1@gmail.com, example+user2.gmail.com, example+admin@gmail.com will all go to the root example@gmail.com address.

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.