You can specify the amount of disk space that Suspect Virus Quarantine uses. The default disk space is 10 GB.
Only administrators with Full Administration rights or Manage Settings modify rights can modify Suspect Virus Quarantine settings.
To modify the disk space allotted for Suspect Virus Quarantine
Click Malware > Settings > Suspect Virus Settings.
Check Maximum size of the Suspect Virus Quarantine to enable the threshold.
Specify the amount of disk space you want to allot for Suspect Virus Quarantine.
The default is 10 GB.
Click Save.
See Specifying how long suspect virus messages are retained in quarantine.