When you email your lightbox as dynamic, the email message will include a URL link to your lightbox. If you add or delete items in the lightbox, the viewer will see the changed lightbox.
When you email your lightbox as static, the email message will include a URL link containing a list of images that are currently in your lightbox. If you add or delete items in the lightbox, the viewer will not see the changes.
Required fields are in bold.