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Getting Started Guide Glossary  113
11 Glossary
Active Directory
A technology that provides a variety of network services,
including LDAP-like directory services.
AD
See Active Directory
Auto-reply
An email reply that is sent automatically to incoming
emails.
Bayesian Filtering
An anti-spam technique where a statistical probability
index based on training from users is used to identify
spam.
Background Intelligent
Transfer Service
A component of Microsoft Windows operating systems
that facilitates transfer of files between systems using
idle network bandwidth.
BITS
See Background Intelligent Transfer Service
Blocklist
A list of email addresses or domains from whom email is
not to be received by users
Botnet
A network of infected computers that run autonomously
and are controlled by a hacker/cracker.
CIDR
See Classless Inter-Domain Routing
Classless Inter-Domain
Routing
An IP addressing notation that defines a range of IP
addresses.
Demilitarized Zone
A section of a network that is not part of the internal
network and is not directly part of the Internet. Its
purpose typically is to act as a gateway between internal
networks and the internet.
Disclaimer
A statement intended to identify or limit the range of
rights and obligations for email recipients
Domain Name System
A database used by TCP/IP networks that enables the
translation of hostnames into IP numbers and to provide
other domain related information.
DMZ
See Demilitarized Zone
DNS
See Domain Name System
DNS MX
See Mail Exchange
Email monitoring rules
Rules which enable the replication of emails between
email addresses.
False negatives
Spam emails that are not detected as spam.
False positives
Legitimate emails that are incorrectly identified as spam.
Greylist filter
An anti-spam filter that blocks emails sent from
spammers that do not resend a message when a retry
message is received.
Ham
Legitimate e-mail
IIS
See Internet Information Services