Postfix errors in centOS7?

Question

CentOS

echo "Test" | mail -s "Checking the operation of the mail server" [email protected]
work contains invalid character '\321'
of the mail server contains invalid character '\320'
"contains invalid character '\321'
What does this mean tell me?
Mail leaves the server, but now it does not come to my corporate addresses?!

Answer 1

Are you copying this line to the terminal?
Replace quotes with "such"