Руководство Пользователя для Cisco Cisco Email Security Appliance C170

The IronPort appliance offers a unique, layered approach to stopping spam at the 
email gateway. The first layer of spam control, reputation filtering, allows you to 
classify email senders and restrict access to your email infrastructure based on 
senders’ trustworthiness as determined by the IronPort SenderBase™ Reputation 
Service. The second layer of defense (discussed in the next chapter), scanning, is 
powered by IronPort Anti-Spam™ technology. Coupled together, reputation 
filtering and anti-spam scanning offer the most effective and highest performing 
anti-spam solution available today.

Using the IronPort appliance, it is very easy to create policies to deliver messages 
from known or highly reputable senders — such as customers and partners — 
directly to the end user without any anti-spam scanning. Messages from unknown 
or less reputable senders can be subjected to anti-spam scanning, and you can also 
throttle the number of messages you are willing to accept from each sender. Email 
senders with the worst reputation can have their connections rejected or their 
messages bounced based on your preferences.

The unique, two-layer approach to fighting spam of the IronPort appliance 
provides you with a powerful and unprecedented flexibility to manage and protect 
your enterprise email gateway.

This chapter contains the following sections: 

The following chapter, Anti-Spam, discusses the anti-spam scanning engine in 
detail.