There are various security risks that exploit email: Malware infections, phishing scams, spam emails, email mismailing, eavesdropping, spoofing, falsification etc. By neglecting email security measures, the risk of information leakage is increased, and it can be infected with malware, etc. and even be targeted by organized cybercriminals. Users need to be careful, as they may suffer damage from their own mistakes and leniency. There are two main cases of mail mistransmission: input error of destination email address and attachment incorrectly.”]
Source: https://hackercombat.com/5-fundamental-cybersecurity-issues-with-email/