Apple Mac OS X Server Version 10.4 or Later Manual do Utilizador descarregar pdf (Página 18)

18 Chapter 1 Mail Service Setup

User Interaction With Mail Service

Mail is delivered to its final recipient using a mail user agent (MUA). MUAs are usually

referred to as “email clients” or “email applications.” These email clients often run on

each user’s local computer. Each user’s email application must be configured to send

messages to the correct outgoing server and receive messages from the incoming

server. These configurations can affect your server’s processing load and available

storage space.

Where Mail Is Stored

Mail is stored in either an outgoing queue awaiting transfer to a remote server or in a

local mail store accessible by local mail users.

Outgoing Mail Location

Outgoing mail messages are stored, by default, in the following spool directory on the

startup disk:

/var/spool/postfix

This location is temporary, and the mail is stored until it’s successfully transferred out to

the Internet. These locations can be moved to any accessible volume (either local or

NFS mounted) and symlinked to by the mail administrator.

Incoming Mail Location

The mail service keeps track of incoming email messages with a small database

(BerkeleyDB 4.2.52), but the database doesn’t contain the messages themselves. The

mail service stores each message as a separate file in a mail folder for each user.

Incoming mail is stored on the startup disk in the following directory:

/var/spool/imap/user/[user name]

Cyrus puts a database index file in the folder of user messages. You can change the

location of any or all of the mail folders and database indexes to another folder, disk, or

disk partition. You can even specify a shared volume on another server as the location

of the mail folder and database, although using a shared volume incurs performance

penalties. For remotely mounted filesystems, NFS isn’t recommended. The incoming

mail remains on the server until deleted by an MUA.

Cyrus mail storage can also be split across multiple partitions. This can be done to scale

mail services, or facilitate data backup. See “Creating Additional Mail Store Locations”

on page 62 for more information.

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Apple Mac OS X Server Version 10.4 or Later Manual do Utilizador Página 18