The Postfix configuration files normally reside in
/etc/mail/, although this may vary from distribution to distribution. The main files are
master.cf. To create an email gateway, perform the operations described in the following sections.
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 and other common aliases should be configured. This is done by editing the
/etc/mail/aliases file and altering the entries ...