How can I cancel an invitation?

Start at 123invitations.com
Click on “Manage” (Manage your Invitations) menu.
Login to your account.
Click on "Delete this Event" link. That's it. Instant email regarding the cancellation of the event will be sent to all the guests. Please note that this can be done only before the scheduled date of the Event. In case you want to delete the event from your account simply click on delete.