On October 15, 2019, please be advised on the upcoming change to how spam will be handled:
“Microsoft Office 365 is updating the quarantine notifications and alerts messages that users will receive. Currently, users can release emails from quarantine directly from the notification email. After mid-October, users will no longer be able to release quarantined emails from the notification email itself; they will only be able to “Block Sender.” To review and release quarantined emails back into their mailbox, users will have to sign in to the Office 365 Security and Compliance Quarantine website.” (from https://news.vanderbilt.edu/2019/10/10/microsoft-office-365-changes-to-notification-messages-regarding-quarantined-emails-in-vumailguard/)