Incoming mail is scanned by the University’s Exchange Online Protection (EOP). Sometimes emails from external websites such as Spend Dynamics, Thompson Ahern, CentreSuite etc. are incorrectly marked as spam and delivered to the Junk Email folder instead of the Inbox folder.
If you don’t receive a notification email, always check your junk mail folder.
For more information, the IT Service Center has a Knowledgebase article on adding emails to your safe senders list.