Note: This guide has been created in Outlook 2013, other versions will be similar.
The following guide will show how to mark an email that has been delivered to your Inbox as spam, so that in the future it will go to the junk folder.
- Open the Inbox folder in Outlook.
- Find the email you wish you mark as junk (always receive in Junk E-mail) and right click on it.
- Go to Junk and then click Block Sender. (The areas to click are marked by the red boxes)
- The email will now be marked as "junk", and future email like this will be sent to your Junk Folder.