To delete multiple Connections, check the checkboxes in the left margin of the Mailbox home page for all the Connections that you would like to delete. Then simply click the "Delete" button. You can then review the Connections that you have chosen to delete, and, if you choose, even send them a pre-written Courtesy Reply. Go ahead, do the right thing and let someone know if you're not a fit… They'll appreciate it—and you would, too.