Email is a vital communications tool for business, but also presents a security risk as its open nature
and widespread use makes it a rich target for malicious actors. Previously, email attacks took the form
of worms and viruses, which would attempt to deploy harmful software to a users’ PCs and then spread
rapidly across the local network. Today, the objective of most email attacks is to commit theft – actual
fraud involving money transfers.
https://www.payrollnetwork.com/cybersecurity-threats-protecting-organizations/