"It's polite to type ""thank you"" on work messages."
Ted is a manager and needs to send out a lot of instructional emails to his team about a new project.
Ted wants to get the emails sent.
Ted sends his team instructions and thanks each of them for their hard work in this trying time.
Ted goes through the list of his employees and writes a quick email about what they need to do, with no signature.
The team feels busy but grateful and believe that Ted appreciates them.
Ted's employees see nothing but orders and think that Ted is insensitive and ungrateful.