Check Your Junk E-mail Folder
In October, ITS implemented a default spam rule for all Outlook (Exchange) email accounts. Besides saving the time spent sorting through spam email, this rule reduces the risk of scams and viruses.
It is a good idea, every once in a while, whether or not you have a spam rule applied to your email account, to check your "Junk E-mail" folder now and then to make sure everything that is there belongs there.
Once a message is placed in your Junk E-mail folder, it will stay there for 30 days; it will then be moved to the Deleted Items folder where it will stay for another 30 days. If you see a message in your Junk E-mail or Deleted Items folder that was inadvertently identified as spam, you can drag it to your Inbox. You can then create an exception for the sender of that message.
If you wish to disable or modify the default rule, or if you want to create your own rule, go to how to Manage Spam (Exchange).