Entourage's Bulk Forward allows users to easily forward multiple received messages simultaneously. It streamlines the task of sending messages en masse.
A recent update has ironed out some bugs, including one that caused extra copies of the first message to be sent, and another that ignored your "Queue in Outbox" preferences. Now, the script offers a new method of sending that doesn't require any set preferences. By default, running the script will queue the messages for later sending. If you hold down the Command key while running the script, it will send the messages immediately.
To use Bulk Forward (Entourage), you'll need to have Jon's Commands and Microsoft Entourage installed. On the bright side, once you have those applications set up, this script is extremely easy to use and could save you a lot of time when forwarding groups of messages.