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Figure 20-1 Sending and receiving mail with SMTP and POP
Linux Administration: A Beginner s Guide
After all is said and done, supporting both POP and IMAP is usually a good idea It allows users the freedom to choose whatever mail client and protocol best suits them In this chapter, we cover the installation and configuration of the University of Washington (UW) IMAP server, which includes a POP server hook This particular mail server has been available for many years The installation process is also easy For a small to medium-sized user base (up to a few hundred users), it should work well If you re interested in a higher-volume mail server for IMAP, consider the Cyrus or Courier IMAP server Both offer impressive scaling options; however, they come at the expense of needing a slightly more complex installation and configuration procedure
POP AND IMAP BASICS
Like the other services we have discussed so far, POP and IMAP each need a server process to handle requests The server processes listen on ports 110 and 143, respectively Each request to and response from the server is in clear-text ASCII, which means it s easy for us to test the functionality of the server using Telnet This is especially useful for quickly debugging mail server connectivity/availability issues Like an SMTP server, one can interact with a POP or IMAP server using a short list of commands To get a look at the most common commands, let s walk through the process of connecting and logging on to a POP server and an IMAP server This simple test allows you to verify that the server does in fact work and is providing valid authentication Although there are many POP commands, a few worth mentioning are USER PASS
A few noteworthy IMAP commands are LOGIN LIST STATUS EXAMINE/SELECT CREATE/DELETE/RENAME LOGOUT
INSTALLING THE UW-IMAP AND POP3 SERVER
The University of Washington produces a well-regarded IMAP server that is used in many production sites around the world It is a well-tested implementation; thus, it is the version of IMAP that we will install
20:
POP and IMAP
Most Linux distributions have prepackaged binaries for UW-IMAP in the distros repositories For example, UW-IMAP can be installed in Fedora by using Yum like so:
[root@serverA ~]# yum -y install uw-imap
On Debian-like systems, such as Ubuntu, UW-IMAP can be installed by using Advanced Packaging Tool (APT) like so:
yyang@ubuntu-serverA:~$ sudo apt-get -y install uw-imapd
Installing UW-IMAP from Source
Begin by downloading the UW-IMAP server to /usr/local/src The latest version of the server can be found at ftp://ftpcacwashingtonedu/imap/imaptarZ Once it is downloaded, unpack it as follows:
[root@serverA src]# tar xvzf imaptarZ
This will create a new directory under which all of the source code will be present For the version we are using, we will see a new directory called imap-2007b created Change into the directory as follows:
[root@serverA src]# cd imap-2007b/
The defaults that ship with the UW-IMAP server work well for most installations If you are interested in tuning the build process, open the makefile (found in the current directory) with an editor and read through it The file is well documented and shows what options can be turned on or off For the installation we are doing now, we will want to stick with a simple configuration change that we can issue on the command line In addition to build options, the make command for UW-IMAP requires that you specify the type of system that the package is being built on This is in contrast to many other open source programs that use the /configure program (also known as Autoconf) to automatically determine the running environment The options for Linux are as follows: Parameter ldb lnx lnp lmd lrh Environment Debian Linux Linux with traditional passwords Linux with Pluggable Authentication Modules (PAM) Mandrake Linux (also known as Mandriva Linux) Red Hat Linux 72 and later
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