Manually set mail as your official response, after its been sent
Your project may be configured with specific mail types that end a process. If so, you'll need to respond with those defined mail types for the mail to be marked as Responded.
In some cases, it's appropriate to manually mark a mail as responded, after a reply was already sent. For example, you may have accidentally used the incorrect mail type in your reply. This feature allows you to review the replies to a mail before deciding which one is the official response. Then, mark that mail as your response to update the status to Responded.
Your Organization Administrator may need to grant these permissions to your user role. Also confirm your organization sent the mail you are marking as your response.
Remember, this option is available if: