Can you explain the format of aliases?

Currently, email aliases look like this:

They are made of 3 pieces:

  1. A random string (generated automatically): izfPb6zIri.
  2. The address of the website that you are generating the alias for:
  3. The domain name used to create the alias:

The second piece allows Booya! to group aliases in the Browse tab making it possible to manage them easily without requiring a database.