SecurePostFix.sh

# View current configuration
cat /etc/postfix/main.cf | grep inet_interfaces

# Backup current configuration to a date/time stamp formatted file
sudo cp /etc/postfix/main.cf /etc/postfix/main_`date +%Y_%m_%d_%H.%M.%S`.cf

# Make the change
sudo sed -i "s|inet_interfaces = all|inet_interfaces = 127.0.0.1|" /etc/postfix/main.cf

# Review the current configuration
cat /etc/postfix/main.cf | grep inet_interfaces

# Restart the service
sudo systemctl restart postfix

# Get the service status
sudo systemctl status postfix