What is Man in Middle Spoofing attack?

Spoofing is just a part of man in the middle attack. Man in the middle attack happens by the communication between two system, for example this can happen in any form of online communication, such as email, social media, web surfing, etc.
The best way to prevent this is by having Secure/Multipurpose Internet Mail Extensions, or S/MIME for short which encrypts your emails at rest or in transit, ensuring only intended recipients can read them and leaving no chances for hackers to find their way in to alter your messages.

Communication between two devices through Internet cause Man in Middle attack. There only way to prevent it is by having secure online communication.

In computer Security, a man-in-the-middle attack (MITM) is an attack where the attacker secretly relays in middle of two conversation and possibly alters the communication between two parties who believe they are directly communicating with each other.

Man in the middle attack is nothing but a communication attack through which a hacker enters into a conversation between two-party and gains access to the information that the two parties were trying to send each other. The only way to stay secure is by communication through an encrypted medium...