Yes, we call these “Exploders”, they’re like mini mailing lists.
You can create exploders @ your domain, and have it forward to up-to 25 other addresses. This can be useful many different situations, including work situations where you want all your employees on one e-mail list, so you can simply send to employees@your domain, or for simple group postings.
Visit the e-mail exploders section of the Customer Control Panel to set up a new exploder address.