EDIT:: This is done directly on the camera's web page.
First under Network\Advanced Settings
set up your email preferences
Make sure there is a check mark for "Attached Image"
Test to make sure it is sucsessful
Under Event\Smart Event
Tab over to Line Crossing and enable
Choose your create your imaginary line, arming schedule (mine is continuous) 24 hr
Then your linkage method, make sure to check off Send Email.
This will send you 3 pictures, 2 seconds apart not just one single picture.