Each member of your troop has their own E-Mail Inbox.

Go to E-Mail → My Inbox to view all of the messages you have received from members of the troop.

The most recent messages will appear at the top of the list.

Click the View button to see the details of the e-mail, including a list of the recipients.

Click the Reply button to compose an e-mail to the sender and the recipients.

You can view all of the messages that you've sent to other members of the troop by selecting My Sent E-Mail from the E-Mail menu.

Click the View button to see the details of the e-mail, including a list of the recipients.

Click the Reply button to re-send this message or forward it to other members.

Click the Delete button to delete an e-mail that you have sent.  This will not retrieve the e-mail from the recipients, but it will remove it from the troop database.