
106 Glossary
Mac OS X The latest version of the Apple operating system. Mac OS X combines the
reliability of UNIX with the ease of use of Macintosh.
Mac OS X Server An industrial-strength server platform that supports Mac, Windows,
UNIX, and Linux clients out of the box and provides a suite of scalable workgroup and
network services plus advanced remote management tools.
mail access agent See MAA.
mail exchange record See MX record.
mail host The computer that provides your mail service.
mail transfer agent See MTA.
mail user agent See MUA.
mailing list A mail service used to distribute a single email message to multiple
recipients. Mailing list subscribers do not have to be mail users on your mail server.
Mailing lists can be administered by someone other than a workgroup or server
administrator. Mailing list subscribers can often add or remove themselves from lists.
MB Megabyte. 1,048,576 (2
20
) bytes.
megabyte See MB.
MTA Mail Transfer Agent. A mail service that sends outgoing mail, receives incoming
mail for local recipients, and forwards incoming mail of nonlocal recipients to other
MTAs.
MUA Mail user agent. A mail process on a user’s local computer that works with the
MAA to download mail messages and headers to the user’s local computer. This is most
commonly referred to as an email application, or email program.
MX record Mail exchange record. An entry in a DNS table that specifies which
computer manages mail for an Internet domain. When a mail server has mail to deliver
to an Internet domain, the mail server requests the MX record for the domain. The
server sends the mail to the computer specified in the MX record.
name server A server on a network that keeps a list of names and the IP addresses
associated with each name. See also DNS, WINS.
node A processing location. A node can be a computer or some other device, such as
a printer. Each node has a unique network address. In Xsan, a node is any computer
connected to a storage area network.
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