When is it not appropriate to send a message via e-mail?

when dealing with highly emotional issue

Explanation:

It is not appropriate to send a message via email when something emotional and personal is happening. The correct thing is to wait for this period to pass and then send a professional and formal message, without the interference of emotional issues that can change the real meaning of your message. When sending an email message, this message should be sent at a rational and impartial time to any emotion.

go to crash course lititure and go to seconed page and it shows a video about that

the correct order is:

you're your own worst enemy:

they're going to say what they say, but

their opinions aren't holding you

back. it's your self-defeatist

attitude that's keeping your work

from getting its due.