The quarantine mailbox is a separate inbox that stores emails that have been flagged as potentially harmful or suspicious. The mailbox is designed to prevent these emails from reaching the user’s primary inbox, allowing them to avoid opening or interacting with potentially harmful messages.

As we understand, some of the spam emails received on your domain are already tagged as suspicious or unverified (this means the spam filters have already identified them as non-legit) But to avoid false positives the emails are delivered to user’s Inbox.

However, now we have a quarantine feature that will hold suspicious & other spam-tagged emails in the quarantine mailbox. The user will get a mail notification that a particular mail is quarantined & if the user needs the mail then the admin can release such quarantined emails.

The Quarantine feature is available for activation on the domain, you can enable it from admin panel as per the steps mentioned in below video: