We recommend to review the AntiSpam and Email Quarantine Guides as these provide further details on the deployments tasks that administrators need to take to deploy and manage the service:
Follow these steps to deploy email quarantine to specifically targeted users (for example, key personnel). Caveat: Emails from domains that publish a DMARC policy may be rejected, quarantined or tagged if they fail validation, according to the sending domain’s DMARC policy. If the emails are quarantined, your end users may automatically receive an Email Quarantine welcome message and summary notification.”
Group settings are not available by default. Contact the Support team to be provisioned with this feature. When you define a group for the Anti-Spam services, you can apply customized detection settings, actions for suspect mail, and approved and blocked senders lists to the members of the group.
There are two limits to consider when managing Anti-Spam groups. The maximum number of groups per domain is limited to 20. The maximum number of users within these groups is limited to 150 across all groups, per domain.