One of GMail's handier features that people are still surprised to learn about is the ability to make multiple, unique address aliases [1] on the fly.

If your GMail address is example@gmail.com [2], emails sent to example+user1@gmail.com [3], example+user2.gmail.com, example+admin@gmail.com [4] will all go to the root example@gmail.com [2] 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.