Phishing is a Cyber Attack which the attacker sends fake emails to attract users to visit fake websites to obtain the user’s personal information. Targeted malicious emails (TME) breaching computer network have become more insidious and more widely documented in recent years. Beyond spam or phishing designed to trick users into revealing personal information, TME can exploit computer networks and gather sensitive information. They can consist of persistent and coordinated campaigns that can span years. A new email-filtering technique based on email's persistent-threat and recipient-oriented features with a Naïve Bayes classifier Algorithm. This paper, how to detect a targeted malicious packet (email) for normal network into modern network. We develop a router detection protocol that dynamically infers the precise number of congestive packet losses that will occur.