socket.error: [Errno 13] Permission denied when creating a fake email server

Question

I\'m trying to create a fake email server as part of a Flask app to print out errors on the console by using the following script. However, it throws an error. How can I fix

Answer 1

Execute program with root or sudo previliages, but as suggested above this is not recommended,

so setup your service on port >= 1024 and then setup reverse proxy for your service, or

redirect all traffice from port 25 to your service port,

For example :

/sbin/iptables -t nat -I PREROUTING -p tcp --dport 25 -j REDIRECT --to-port 2525