This is a great guide to iptables: An In-Depth Guide to iptables, the Linux Firewall
Category: Linode
Tutorial: Installing OpenVPN on Ubuntu 16.04
Tutorial: Installing OpenVPN on Ubuntu 16.04 To configure iptables look here: https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04
How to Configure OpenVPN Access Server to Tunnel Traffic
https://linode.com/docs/networking/vpn/configure-openvpn-access-server-to-tunnel-traffic/
Install OpenVPN Access Server on Linux for Secure Communications
https://linode.com/docs/networking/vpn/install-openvpn-access-server-on-linux/
Install Roundcube on Ubuntu 16.04
https://linode.com/docs/email/clients/install-roundcube-on-ubuntu/
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