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Configuring an
IMAP Server
IMAP server installation and configuration
works much like that for POP servers. As noted earlier, UW IMAP ships with most
Linux distributions, and some distributions include other servers as well. Configuration
is usually a matter of installing the package, checking or making a small
change to a super server configuration, and restarting the super server.
IMAP Servers for Linux
Many of the packages described in the earlier
section, "
IMAP, and Courier all support IMAP as well as POP. In 2002, searches on
them are very new and have no working code available, or they fill rather
esoteric niches, like a proxy server to allow Web browsing via IMAP.UW IMAP, the most popular IMAP server for
Linux, stores most mail folders as files in mbox format in the Linux user's
home directory. This may be undesirable if users have regular login accounts on
the computer, because users might not recognize the purpose of the files and so
might delete or move them. (You can change the default location of the mbox
files by editing the source code and recompiling, as described in the CONFIG file that
comes with the program's documentation.) Cyrus IMAP, on the other hand, uses
its own proprietary format for everything but the mbox-format incoming mail
folder. Courier IMAP uses the maildir format, which qmail uses by default and
that is available as an option in Postfix and Exim, among others.
IMAP Server Installation and Configuration
Most distributions ship with UW IMAP in a
package called imap or something similar. You can install this package and configure
the IMAP server to run using your super server, as described in
it's running, UW IMAP uses your normal login database to authenticate users, so
any user with a regular account and an active password can read e-mail using
IMAP. As with POP configuration, there's no separate configuration file for
IMAP options; just run it from your super server, and it should work.
