A secretary must send 4 emails to person A, B, C, and D.

However on a given day, suppose this incompetent secretary sends those 4 emails in a completely randomly order, let $\mathcal{P}$ denote the probability of each person received the wrong email.

What is the value of $24 \mathcal{P}$?

**Details and Assumptions**

- Each person A, B, C, D received exactly one email.