Notification of an illegal attachment
Occasionally you may receive a notification of an illegal attachment.
Illegal Attachment Notification
When this notification appears it is because the potential for malicious code being received in the attachment is high, although no virus was detected. As a precaution the email is destroyed and, in the case of an incoming email, the intended recipient is notified immediately. If the email is outbound then the sender is notified instead.
The Subject of the email is displayed as well as the sender. This allows the notification recipient to follow up and report that they cannot receive the attachment by email.