How We Handle Spam
Each day the Denton ISD email system processes over 100,000 incoming messages. On average, 90% of these are identified as spam - unsolicited, unwanted messages that take time and resources to process and delete.
Denton ISD makes use of spam filtering from Cisco IronPort. This appliance scans every incoming message and evaluates it. Based on an intricate algorithm, the message is either sent on to the recipient or it is flagged as spam and archived for up to fourteen days. The recipient (teacher, principal, etc.) receives a Spam Notification each morning showing the previous day's spam. They have the option to whitelist (permanently allow) mail from this address to be delivered, or simply ignore it and the message will stay blocked. This gives the individual the power to control their own incoming spam.
It is the individual employee's responsibility to check their Spam Notification and whitelist (unblock) any messages they want to receive.
If the employee sends a message to an internet address, that address is auto-whitelisted - a reply will automatically be allowed without being blocked. It is a good idea for teachers to send an email to all their classroom parents - this adds them to the teacher's whitelist so future emails will be allowed through the filter.
All virus-infected messages are blocked - regardless of whitelist status.