Add known senders to the Safe Senders list to ensure that their email will not go to your Junk/Quarantine folder.

This feature works the same in all modern versions of Microsoft Outlook: 2010, 2013, and 2016.

• On the Ribbon, from the Home tab, in the Delete group, select Junk. 
  • 
• From the drop-down list, select Junk E-mail Options. 
  • 
• Select the Safe Senders tab.
  •  
• Click Add. 
  • 
• In the Add address or domain dialog box, type an email address or domain.
  •  
• Click OK.
  •  
• In the Junk E-mail Options dialog box, click Apply to save your changes. Emails from this sender will now be prevented from automatically going to your Junk E-mail folder.
  •