Symantec 10490452 Administration Guide - Page 239

Glossary 239 Control Center A Web-based configuration and administration center for Symantec Mail Security for SMTP. Each site has one Control Center. The Control Center also houses Spam Quarantine and supporting software. You can configure and monitor all of your Scanners from the Control Center. defer An action that an MTA receiving an email message can take, which consists of using a 4xx SMTP response code to tell the sending MTA to try again later. dialog box A secondary window containing command buttons and options available to users for carrying out a particular command or task. dictionary A list of words and phrases against which email messages can be checked for noncompliant content. Symantec Mail Security for SMTP allows you to create Content Compliance filters that screen email against a specific dictionary. You can use the provided dictionaries, add terms to the provided dictionaries, or add additional dictionaries. directory harvest attack A high volume email campaign addressed to dictionary-generated recipient addresses on a specific domain. Directory harvest attacks (DHAs) not only consume resources on the targeted email server, they also provide the spammers with a valuable list of valid email addresses (targets for future spam campaigns). Symantec Mail Security for SMTP allows you to identify and defuse directory harvest attacks. DMZ (de-militarized zone) A network added between a protected network and an external network to provide an additional layer of security. Sometimes called a perimeter network. DNS (Domain Name Server) proxy An intermediary between a workstation user and the Internet that allows the enterprise to ensure security and administrative control. DNS (Domain Name System) A hierarchical system of host naming that groups TCP/IP hosts into categories. For example, in the Internet naming scheme, names with .com extensions identify hosts in commercial businesses. DNS server A repository of addressing information for specific Internet hosts. Name servers use the Domain Name System (DNS) to map IP addresses to Internet hosts. domain 1. A group of computers or devices that share a common directory database and are administered as a unit. On the Internet, domains organize network addresses into hierarchical subsets. For example, the .com domain identifies host systems that are used for commercial business. 2. A group of computers sharing the network portion of their host names, for example, raptor.com or miscrosoft.com. Domains are registered within the Internet community. Registered domain entities end with an extension such as .com, .edu, or .gov or a country code such as .jp (Japan). downstream At a later point in the flow of email. A downstream email server is an email server that receives messages at a later point in time than other servers. In a multiple-server system, inbound mail travels a path from upstream mail servers to downstream mail servers. Downstream can also refer to other types of networking paths or technologies.