We should never ever rely on emails for anything important. We should always confirm and authenticate important matters with a separate channel like meeting in person or video calling or calling the persons to confirm the veracity of an important action that was written in an email. Unfortunately that is not the case and there are so many such frauds.

The use of email for important matters leads to Business Email Compromise fraud:

https://www.fbi.gov/scams-and-safety/common-scams-and-crimes...