Apple Mac OS X Server Migration For Version 10.3 or Later Instrukcja Użytkownika Pobierz pdf (Strona 52)

52 Glossary

LDA (local delivery agent) A mail service agent that transfers mail messages from

incoming mail storage to the email recipient’s inbox. The LDA is responsible for

handling local delivery of messages, and making mail accessible to the user’s email

application.

list administrator A mailing list administrator. List administrators can add or remove

subscribers from mailing lists, and designate other list administrators. List

administrators are not necessarily local machine or domain administrators.

load balancing The process of distributing the demands by client computers for

network services across multiple servers in order to optimize performance by fully

utilizing the capacity of all available servers.

MAA (mail access agent) A mail service that communicates with a user’s email

program to download mail messages or headers to the user’s local machine.

mail exchanger The computer that provides your mail service. Synonymous with mail

host.

mail host The computer that provides your mail service. Synonymous with mail

exchanger.

mailing list A mail service 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 a list administrator. Mailing list subscribers can often add or

remove themselves from lists.

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 machine that works with the

MAA to download mail messages and headers to the user’s local machine. 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 See DNS (Domain Name System).

open relay A server that receives and automatically forwards mail to another server.

Junk mail senders exploit open relay servers to avoid having their own mail servers

blacklisted as sources of spam.

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Apple Mac OS X Server Migration For Version 10.3 or Later Instrukcja Użytkownika Strona 52