To complete the picture for a better understanding, here’s a shot of what it looks like on my router under the port forwarding section.
I hope your dad is not around
These are standard mail ports.
Just look at how they’re mapped. I added those, just like you’ve added 5000 and 5001 on yours.
Your router will have something like
5000-5000 5000-5000 192.168.10.250 enable
And another one for 5001
And here, we have the ports used by Synology. Scroll down to see where 5000 and 5001 are being used. It starts at web applications.
Give us an update on where you are in the firewall configuration, and we’ll continue implementing our simple 3 rules.