Hello Jingwei, I am not sure whether I can meet your requirements. So what do you want to do spec...
Email community administrator
You can send a private email to community administrator who made his/her email address public for the community. This feature is mainly
designed for community leader or organization support staff to receive direct emails from users who do not want
to use the public board for specific issues.
A private email is directly sent through email server and is not saved on our system.