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Checking Your Junk and Quarantine Folders
Within your Inbox in Outlook, there are two additional folders that keep emails for your protection. You should check those folders for possible missing emails. They have been flagged according to the information below. To access either folders, please follow these steps:

1. Open Outlook

2. In the left pane make sure you are in your Inbox

3.  In your folder list, you can find the Junk Email folder, as well as the Quarantine folder
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4. Click on the name of the folder to access email items

A quarantined email has been through Microsoft's filtering system that flags it as a potential threat to SU network security. The email filtering system then moves it to a quarantine area instead of delivering it to your inbox. Outlook blocks the sending and receiving of certain types of files (such as .exe and certain database files) as attachments. If you need to send one of these file types to an email recipient, we recommend using OneDrive and sending the recipient a link to the file instead. See Microsoft Office 365 Outlook Email Quarantined File Extensions for a complete list.  

Quarantined emails are still accessible through the Quarantine folder within your inbox. It acts very much like the Junk folder. If you are expecting an email from someone and it doesn't come through, it could be because it was a high-level quarantined message and will need further assistance from the Help Desk. Please create a ticket to have support technicians review high-level quarantines for the email and they can restore it to your inbox if has been received. If you find that a certain email sender is being sent to quarantine often, you can add them to your Safe Senders list within Outlook to alleviate additional steps to retrieving their messages.

Junk vs Quarantine
Outlook attempts to filter out junk, keeping the Inbox clear of content you don't want to see. Usually, junk mail (advertisements, contests, spam, social marketing, etc.) is delivered to the Junk Email folder. Quarantined emails usually contain potentially dangerous or unwanted messages, such as phishing emails or malware.

Messages containing the following attachment types are automatically quarantined in Exchange Online:

.ace, .ani, .app, .docm, .exe, .jar, .reg, .scr, .vbe, .vbs

• Check a list of known (Microsoft managed), malicious links when users click links in Email or Microsoft Teams. URLs are rewritten by default.  Malicious links are blocked and click tracking is enabled.  See Advanced Threat Protection(ATP)/SafeLinks Email Scan for more information.