AY Mail supports the list of senders independently of the projects, so that you can easily select senders from this list. In most cases, you need only one sender - you.
Add lets you add new senders to the list. The Sender Properties dialog will open to let you enter the sender information.
Edit opens the Sender Properties dialog to let you edit the settings for the currently selected sender.
Remove deletes the selected sender.
Currently Selected displays the information for the selected sender exactly as it will appear in email headers.