Abstract: e-Mail is the most important internet application and most commonly used as the primary means of communication between individuals around the world. In the light of the state’s economic revolution and tremendous techniques sweeping the country in the recent years which seeks to establish the concept of e- Government practically, the UAE legislator is keen to report on criminal protection of e-Mail by issuing the Federal Law No. 5 for the year 2012 on combating cybercrimes. This research aims to demonstrate the effectiveness of the UAE law in combating against molestering e-Mail and protecting it from intrusion or espionage. To achieve that, the researcher is opted to check what e-Mail means and stating the advantages and disadvantages of it and then deals with all forms of penal protection of e-Mail in the UAE law as well as the general rules of responsibility for the crimes of assault on the e-Mail and finished the research by conclusion including the most important findings and recommendations.