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Some notes regarding the installation & configuration of postfix in the most secure way I know so far today.
The target operating system is an Ubuntu 16.
sudo apt-get install postfix
Copy the default config:
cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
This is my configuration for a host that it is isolated in internet, and it has no special needs (it is not the mail server for any domain, it only needs to send some emails):
# See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. myhostname = cloud.mister-i.com mydomain = mister-i.com myorigin = $myhostname mydestination = $myhostname, localhost, novaprime mynetworks_style = host relay_domains = $mydestination smtpd_banner = $myhostname ESMTP $mail_name biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no