====== Install and Configure Postfix as a Send-Only SMTP Server ======


  - Start with a fully updated and configured Ubuntu server.
  - Install Postfix<code>
sudo debconf-set-selections <<< "postfix postfix/mailname string `hostname -f`"
sudo debconf-set-selections <<< "postfix postfix/main_mailer_type string 'Internet Site'"

sudo apt-get install -y mailutils

</code>
  - Restart Postfix with ''sudo service postfix restart''
  - Forward System Emails:<code bash>
cp /etc/aliases /tmp/
cat >> /tmp/aliases << EOF
root:          user@example.com
EOF
 
sudo mv /tmp/aliases /etc/aliases

sudo chown root:root /etc/aliases

sudo newaliases
</code>
  - Test sending an email:<code>
echo "Test body" | mail -s "Subject Line" root
</code>