Fortigate 100D - URL clicks in Email - logs/history

Good day all.

Just some general knowledge.

What is the quickest method to find history/logs blocked hyperlinks/urls in emails and who (source lan ip) clicked on them, i.e. the amount of hits on that url link in email body. We are doing a penetration test and the fortimail purchased has not been put online as that would be the perfect place for logs. I have not logged on to the fortigate box enough as yet to peruse. A cli and/or even gui method is fine. This will be very helpful for knowledge base.