Connect internet when VPN

Open Network Connections Manager, choose your VPN connection, click on Routes... button

If your VPN network in 10.x.x.x you can setup like this

Disconnect VPN and reconnect, you can access internet with it.

Default iptables rules when install ireadmail

When I install iredmail, the default iptables rule file has created in /etc/default/iptables

Please careful when edit it because it can block access to your system.