Include Invitees in Next Send
After you first run an invitation process, you can continue to run the process to send additional invitations. When you run the process again, you can include invitees not already sent the invitation or those who require another invitation. To include an invitee in a future instance of the invitation process, on the Invitees tab of an invitee list page, select the down arrows next to the invitee to include and select Include in next send on the action bar. When you first add an invitee, the program marks the invitee as Include in next send until you next run the invitation process.