Send messages from Mail with different "from" address

I funnel all my email accounts through my Gmail account, and I use IMAP and Mail.app to administer that account.Gmail offers the ability to send messages using a different "from" field and I want to see if that feature can be replicated in Mail. Is this possible either out of the box or with a plugin? I want to be able to do this without adding a new account with POP or SMTP settings, ideally.