Automate the installation of postfix on Ubuntu

You can use pre-seeding for this, using the debconf-set-selections command to pre-answer the questions asked by debconf before installing the package.

For example:

debconf-set-selections <<< "postfix postfix/mailname string your.hostname.com"
debconf-set-selections <<< "postfix postfix/main_mailer_type string 'Internet Site'"
apt-get install --assume-yes postfix

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