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![Configuration Configuration](http://lh4.ggpht.com/-cIEml5HIGSo/VKMxImaWb1I/AAAAAAAAA90/DcreMG2UOSU/image_thumb%25255B31%25255D.png?imgmax=800)
By default, Postfix configuration files are in /etc/postfix. The two most important files are main.cf and master.cf; these files must be owned by root. Giving someone else write permission to main.cf or master.cf (or to their parent directories) means giving root privileges to that person.
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Nota bene: Notice: This documentation was written for CentOS 5. It may not be accurate for CentOS 6 or subsequent releases. Introduction This article is aimed at beginners who wish to set up a basic email server. Basic system administration knowledge would be an advantage and the ability to install software and edit configuration files is essential. East asian language pack windows 7. The article was written for CentOS 5 but should be equally applicable to earlier versions. Later versions may differ.
There are many different scenarios and combinations that can be used when setting up an email server (far to many to cover here), so this article makes some basic choices for you, such as the software we will use (postfix and dovecot). Other options are required to be altered by the user, such as your network addresses and domain names. More advanced options such as virtual domains and users are outside the scope of this article and will not be covered herein. This article uses postfix as the mail transport agent (MTA), as opposed to sendmail, the default MTA for CentOS 5 (postfix is the default in CentOS 6). Dovecot is used to allow users to access their email by either imap or pop protocols. We assume a domain name of example.com which should be changed by the reader and can be either a real domain name for a fully qualified email server or a fake domain name if you only wish to implement an internal mail server. We assume that the physical mail server (host) is mail.example.com and is located at the private IP address 192.168.0.1 (this should be changed to suit the readers needs).
The email server will provide email accounts via standard user system accounts and users will access their email using their system account username and password. We will assume a user called John Smith who has a system account under the login name of john. Installation The first thing we need to do is install the requisite software. The easiest way to do this is with yum from the command line: yum install postfix dovecot system-switch-mail system-switch-mail-gnome Yum should automatically resolve any dependencies. Dovecot is dependent on mysql and perl, so these will likely be installed too if they are not already installed on the system. Alternatively, we can skip 'system-switch-mail' and 'system-switch-mail-gnome' installation and remove the default MTA 'sendmail', this will make 'postfix' the default MTA in our system. Yum install postfix dovecot yum remove sendmail Please note that the default MTA in CentOS 5 is sendmail.
Postfix Configuration
If you do not make postfix the default MTA, updating postfix may cause the default MTA to revert to sendmail. Configuration Next we need to configure the various parts of our email server.