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The configuration files for Postfix are human readable and support upward of 250 directives. Unlike Sendmail, no macro processing is required for changes to take effect and the majority of the most commonly used options are described in the heavily commented files.
====== The Default Postfix Installation indexterm:[Postfix,default installation] The Postfix executable is `postfix`. This daemon launches all related processes needed to handle mail delivery.
Postfix stores its configuration files in the `/etc/postfix/` directory. The following is a list of the more commonly used files:
`access` — Used for access control, this file specifies which hosts are allowed to connect to Postfix.
`main.cf` — The global Postfix configuration file. The majority of configuration options are specified in this file.
`master.cf` — Specifies how Postfix interacts with various processes to accomplish mail delivery.
`transport` — Maps email addresses to relay hosts.
The `aliases` file can be found in the `/etc/` directory. This file is shared between Postfix and Sendmail. It is a configurable list required by the mail protocol that describes user ID aliases.
Configuring Postfix as a server for other clients
The default `/etc/postfix/main.cf` file does not allow Postfix to accept network connections from a host other than the local computer. For instructions on configuring Postfix as a server for other clients, see xref:Mail_Servers.adoc#s3-email-mta-postfix-conf[Basic Postfix Configuration].
Restart the `postfix` service after changing any options in the configuration files under the `/etc/postfix` directory in order for those changes to take effect. To do so, run the following command as `root`:
~]#{nbsp}systemctl restart postfix
====== Basic Postfix Configuration
By default, Postfix does not accept network connections from any host other than the local host. Perform the following steps as `root` to enable mail delivery for other hosts on the network:
Edit the `/etc/postfix/main.cf` file with a text editor, such as [command]#vi#.
Uncomment the [command]#mydomain# line by removing the hash sign (`#`), and replace _domain.tld_ with the domain the mail server is servicing, such as [command]#example.com#.
Uncomment the [command]#myorigin = $mydomain# line.
Uncomment the [command]#myhostname# line, and replace _host.domain.tld_ with the host name for the machine.
Uncomment the [command]#mydestination = $myhostname, localhost.$mydomain# line.
Uncomment the [command]#mynetworks# line, and replace _168.100.189.0/28_ with a valid network setting for hosts that can connect to the server.
Uncomment the [command]#inet_interfaces = all# line.
Comment the [command]#inet_interfaces = localhost# line.
Restart the [command]#postfix# service.
Once these steps are complete, the host accepts outside emails for delivery.
Postfix has a large assortment of configuration options. One of the best ways to learn how to configure Postfix is to read the comments within the `/etc/postfix/main.cf` configuration file. Additional resources including information about Postfix configuration, SpamAssassin integration, or detailed descriptions of the `/etc/postfix/main.cf` parameters are available online at link:++http://www.postfix.org/++[http://www.postfix.org/].
====== Using Postfix with LDAP
Postfix can use an `LDAP` directory as a source for various lookup tables (e.g.: `aliases`, `virtual`, `canonical`, etc.). This allows `LDAP` to store hierarchical user information and Postfix to only be given the result of `LDAP` queries when needed. By not storing this information locally, administrators can easily maintain it.
The /etc/aliases lookup example
The following is a basic example for using `LDAP` to look up the `/etc/aliases` file. Make sure your `/etc/postfix/main.cf` file contains the following:
alias_maps = hash:/etc/aliases, ldap:/etc/postfix/ldap-aliases.cf
Create a `/etc/postfix/ldap-aliases.cf` file if you do not have one already and make sure it contains the following:

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Uncomment the [command]#mydomain# line by removing the hash sign (`#`), and replace _domain.tld_ with the domain the mail server is servicing, such as [command]#example.com#.
Uncomment the [command]#mydomain# line by removing the hash sign (`#`), and replace _domain.tld_ with the domain the mail server is servicing, such as [command]#example.com#.
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./pages/servers/Mail_Servers.adoc:258
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pot/f27/pages/servers/Mail_Servers.pot, string 93