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the Outlook Web Access interface to Exchange Server, it is also an MUA) Lotus Domino also works in a similar fashion Postfix, on the other hand, works as an MTA only, passing the task of performing local mail delivery to another external program This allows each operating system or site configuration to use its own custom tool, if necessary (that is, to be able to use a special mailbox store mechanism) In most straightforward configurations, sites prefer using the Procmail program to perform the actual mail delivery (MDA) This is because of its advanced filtering mechanism, as well as its secure design from the ground up Many older configurations have stayed with their default /bin/mail program to perform mail delivery
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INSTALLING THE POSTFIX SERVER
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In this section, we will cover the installation of the Postfix mail server We chose it for its ease of use and because it was written from the ground up to be simpler than Sendmail (The author of Postfix also argues that the simplicity has led to improved security) Postfix can perform most of the things that the Sendmail program can do in fact, the typical installation procedure for Postfix is to replace the Sendmail binaries completely In this section, we install Postfix in one of two ways: either using the Red Hat Package Manager (RPM) method (recommended) or via source code
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Installing Postfix via RPM in Fedora
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To install Postfix via RPM, simply use the Yum tool as follows:
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[root@fedora-serverA ~]# yum -y install postfix
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Once the command runs to completion, you should have Postfix installed Since Sendmail is the default mailer that gets installed in Fedora and Red Hat Enterprise Linux (RHEL) distros, you will need to disable it using the chkconfig command and then enable Postfix
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[root@fedora-serverA ~]# chkconfig sendmail off [root@fedora-serverA ~]# chkconfig postfix on
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Finally, we can flip the switch and actually start the Postfix process With a default configuration, it won t do much, but it will confirm whether the installation worked as expected
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[root@fedora-serverA ~]# service sendmail stop [root@fedora-serverA ~]# service postfix start
TIP The proper way to change the mail subsystem on a Fedora-based distribution is to use the system-switch-mail program This program can be installed using Yum as follows: yum install system-switch-mail
Linux Administration: A Beginner s Guide
Installing Postfix via APT in Ubuntu
Postfix can be installed in Ubuntu by using Advanced Packaging Tool (APT) Ubuntu, unlike other Linux distributions, does not ship with any MTA software preconfigured and running out of the box You need to explicitly install and set one up To install the Postfix MTA in Ubuntu, run the command
yyang@ubuntu-serverA:~$ sudo apt-get -y install postfix
The install process will offer a choice of various Postfix configuration options during the install process The choices are No configuration This option will leave the current configuration unchanged Internet site Mail is sent and received directly using SMTP Internet with smarthost Mail is received directly using SMTP or by running a utility such as fetchmail Outgoing mail is sent using a smarthost Satellite system All mail is sent to another machine, called a smarthost, for delivery Local only The only delivered mail is the mail for local users The system does not need any sort of network connectivity for this option
We will select the first option, No configuration, on our sample Ubuntu server The install process will create the necessary user and group accounts that Postfix needs With the script in place, double-check that its permissions are correct with a quick chmod
Installing Postfix from Source Code
Begin by downloading the Postfix source code from wwwpostfixorg As of this writing, the latest stable version was postfix-251targz Once you have the file downloaded, use the tar command to unpack the contents
[root@serverA src]# tar xvzf postfix-251targz
Once it is unpacked, change into the postfix-251 directory and run the make command, like so:
[root@serverA src]# cd postfix-251 [root@serverA postfix-251]# make
The complete compilation process will take a few minutes, but it should work without event
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TIP If the compile step fails with an error about being unable to find dbh or any other kind of db reference, there is a good chance your system does not have the Berkeley DB developer tools installed While it is possible to compile the Berkeley DB tools yourself, it is not recommended, as Postfix will fail if the version of DB being used in Postfix is different from what other system libraries are using To fix this, install the db4-devel package This can be done using Yum as follows: yum -y install db4-devel Since Postfix will replace your current Sendmail program, you ll want to make a backup of the Sendmail binaries This can be done as follows:
[root@serverA postfix-251]# mv /usr/sbin/sendmail /usr/sbin/sendmailOFF [root@serverA postfix-251]# mv /usr/bin/newaliases /usr/bin/newaliasesOFF [root@serverA postfix-251]# mv /usr/bin/mailq /usr/bin/mailqOFF
Now we need to create a user and a group under which Postfix will run You may find that some distributions already have these accounts defined If so, the process of adding a user will result in an error
[root@serverA postfix-251]# useradd -M -d /no/where -s /no/shell postfix [root@serverA postfix-251]# groupadd -r postfix [root@serverA postfix-251]# groupadd -r postdrop
We re now ready to do the make install step to install the actual software Postfix includes an interactive script that prompts for values of where things should go Stick to the defaults by simply pressing the enter key at each prompt
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