Hey there, I see there are quite a few people out there getting tickets in Italy. I wanted to share my experience and warn everyone out there about the potential of a scam.
I recently got 3 tickets in the mail from Comune di Bologna - Polizia Municipale. The 2 of the 3 seems like they are a duplicate as the ID numbers are identical. Upon doing some research on the internet, i found no results and finally decided to pay up. HOWEVER, as my last attempt to clarify the situation (as i don't think i went into any ZTL zones) I decided to go to SIXT, my preferred car rental company and see if they would be able to help sort this out as I don't feel comfortable wire transferring ANY money abroad. Before I was leaving the house I pulled up my SIXT account online to print out my invoices for my ITALY rentals. THANK GOD i did that because upon checking my invoices I noticed that the license plate for the car that got tickets was totally different than the license plates for the cars I rented!!! I even checked my SIXT rental car account to see if I got any traffic tickets and it came up null. I checked again and again to see if anything on my invoice remotely looked like the license plate from the tickets that were sent to me and came out with NOTHING! Even the car that the the tickets were for was totally different (FIAT vs RENAULT).
SO with this experience, I strongly advise anyone out there with tickets from anywhere to check their rental agreements and cross check the license plates!