When arrowing up and down the list of messages, whether a 
message is checked to be deleted and/or bounced is now indicated.
When you press B, it acts a toggle.  The first time it marks the
message for bouncing and deletion.  The second time you press it, 
it will remove the bounce mark.
When you press D, it also is a toggle.  It will mark the message
for deletion from the server, or uncheck it when pressed again.
Pressing Control P processes the messages as marked and launches
your email appication.
Pressing Control L launches your email application without processing.
Now when you press space bar on a message to review it, when you
tab to the message body, Jaws will automatically read it.
Insert H provides the following help:
Toggle Bounce status of Message B
Pressing B also marks message for deletion
Toggle Delete from server status of Message D
Process mail and launch email applicaton control + p
Launch email application without processing control + l