Disable Dr.Web Notification mail from Plesk
Edit the file /etc/drweb/drweb_handler.conf as shown below to stop Parallels Premium Antivirus from sending notification messages:
[VirusNotifications]
SenderNotify = no
AdminNotify = no
RcptsNotify = no
Edit the file /etc/drweb/drweb32.ini
CronSummary no
Restart Dr. Web :
/etc/init.d/drwebd restart