Patent ID: 9686218
Date: 2017-06-20
CPC Classifications: H04L

Claim:
1. An email filtering system comprising: a unified threat management gateway that receives an email from a mail transfer agent across a first communication connection, and checks a reputation of an Internet protocol (IP) address of the mail transfer agent; an email security appliance that: receives the email from the unified threat management gateway from the unified threat management gateway over a network communication interface; receives email filter processing rules via a custom simple mail transfer protocol HELO command over a port according to a transmission control protocol, wherein the HELO command is a customized HELO command that includes; ASCII encoded text using name-value pairs to convey information, the Internet protocol (IP) address that identifies the mail transfer agent, and at least one action that is taken according to a threat status associated with the email; identifies a filtered status of the email based on the received processing rules, wherein the unified threat management gateway receives the email and the filtered status of the from the email security appliance over the network interface, sends the to a junk store, and the junk store implements the at least one action according to the threat status associated with the email.