best response confirmed by Jerry Gonzalez (Contributor)
Solution

There are options available that an administrator can configure for end-user spam notifications in Exchange Online:

 

Configure end-user spam notifications in Exchange Online

 

1033.spamnotifications_1

 

According to the documentation, these are disabled by default and can be configured with how often to send the digest, the default being three days with a value of between 1 and 15 days available.

 

"If you specify 7 days, for example, the notification will include a list of all messages intended for that user within the past 7 days that were sent to the spam quarantine instead."

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