To protect you from unsolicited email (also known as SPAM) we quarantine email which Microsoft mark as SPAM. Unfortunately, from time to time, genuine email is incorrectly quarantined. If you believe one of your emails may have been quarantined you can release it here,
https://protection.office.com/quarantine
Find your email in the list and click Release Message. The email will then be delivered to your inbox.
If you cannot find your email, log a call with the St Helens School ICT Service Desk.