There 2 methods of quarantining messages in MxScan.
1. Global Message quarantine store Activated by selecting the FilterAction = Quarantine. Messages that are quarantined are move to a global spam folder. By default this is C:\Program Files\Mail Enable\Queues\SMTP\Inbound\Messages\mxscan_spam\[PostOfficeName]
2. Individual Mailbox Quarantine Activated by selecting the FilterAction = 'MoveTo Inbox Spam Folder' . MxScan will move the messages to the individual user's Mailbox under a subfolder called 'MxScan-Spam'. Individual users can then check the MxScan-Spam folder and if necessary move the messages back to the inbox and/or whitelist the sender