Review Email Messages Identified as Junk

Depending on the protection level that you set for the Junk Email Filter in Outlook, some legitimate email messages might get moved to the Junk Email folder. You should periodically review the messages in the Junk Email folder.

 

Tip:  To prevent the unintended viewing of possibly objectionable messages, you might want to turn off the Reading Pane for the Junk Email folder. On the View tab, click Reading Pane, and then click Off. This doesn’t turn off the Reading Pane for other mail folders.

  1. In the Mail folder pane, click the Junk Email folder.
  2. Click any message that you don’t want to be marked as junk.
  3. On the Home tab, click Junk, and then click Not Junk.

Tip: A message that you mark as not junk is moved to the folder that it was previously in, usually the Inbox. You might be prompted to choose whether you want to add the sender or mailing list name to your Safe Senders or Safe Recipients list.

 

Source: https://support.office.com/en-us/article/review-email-messages-identified-as-junk-afba4d3b-7bf1-461d-911f-abb65ac0f717?ui=en-US&rs=en-US&ad=US