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Install and Configure Postfix as a Send-Only SMTP Server

  1. Start with a fully updated and configured Ubuntu server.
  2. Install Postfix
    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
  3. Restart Postfix with sudo service postfix restart
  4. Forward System Emails:
    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
  5. Test sending an email:
    echo "Test body" | mail -s "Subject Line" root
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