Junk Email is the folder where Outlook sends mail it thinks is spam. You can customize Outlook’s spam filter to block or whitelist senders or domains, or crank up the automatic filtering and delete spam automatically. Let’s see how.
Accessing Junk Email Options
You can access the Junk Email options by clicking Home > Junk.
The top four options will only be available if you’ve got a message selected in a folder, or if you have a message open and you click Message > Junk.
All of these options are also available from the context menu when you right-click a message.
We’ll cover the top four options on this menu as we go through the article. For now, we’re interested in “Junk E-mail Options” at the bottom of the menu.
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Source : How to Customize Junk Email and Safe Senders in Outlook
