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Office 365 (Outlook for Mac) - About junk e-mail protection
No one likes spam or junk email. The Outlook 2016 for Mac Junk Email Filter doesn't stop delivery of junk email messages, but does the next best thing --- it moves suspected spam to the Junk Email folder. We recommend you regularly review messages in the Junk Email folder to check for legitimate messages that were incorrectly classified as junk. If you find a message that isn't junk, drag it back to the Inbox or any folder.
About junk e-mail protection
When the filter finds a message that appears to be junk, Outlook does the following:
- Moves the message to the junk e-mail folder for that account.
- Assigns the message to the junk category.
- Blocks any embedded pictures in the message. In some cases, downloading the pictures in a mail message lets the sender know that your mail address is active. If a junk mail sender knows that your address is active, you are more likely to receive additional junk mail from that sender.