Yes. On the listing info page, you can perform actions in bulk such as sending a message to multiple buyers' agents, reject multiple offers, request highest & best from multiple buyers, etc. To do this:

1. Check the box next to each offer you wish to send to.

2. Select the action you wish to perform.

3. Enter the message you wish to send.

4. Each buyer's agent will receive a separate message. They will not see that they are part of a bulk message. 

In this example the list agent receives 3 offers. They have accepted one and now want to reject the other two. As you can see they check the boxes next to the two lowest price offers and they will select Reject Offers from the Actions drop down.