Configuring Postfix

The Postfix configuration files normally reside in /etc/postfix and /etc/mail/, although this may vary from distribution to distribution. The main files are main.cf and master.cf. To create an email gateway, perform the operations described in the following sections.

Accepting Email for the Domain

Postfix needs to be configured to accept email for the domain. To do this, edit the main.cf file and add or change the following lines, substituting the appropriate domain and hostname:

myhostname = mailgateway.domain.com
mydomain = domain.com
relay_domains = domain.com

Mail for the root User

Mail for the root user and other common aliases should be configured. This is done by editing the /etc/mail/aliases file and altering the entries as shown in the following example:

# /etc/mail/aliases
# Basic system aliases -- these MUST be present.
MAILER-DAEMON: postmaster
postmaster: root
# General redirections for pseudo accounts.
adm: root
bin: root
daemon: root
exim: root
lp: root
mail...