9. I'd like to set up a board so that the mail is not sent to the instructor when the post is registered on the board.

The course Q&A board is set to Receive Mail - Yes, so an email will be sent to the instructor when the article is registered on the board.

To prevent mail from being sent to the instructor, set it to 'Send mail - No'.

Send mail: An email will be sent to the instructor when the message is registered on the board,and an email will be sent to the original writer when the reply is registered.