Running an email server on a VPN client, wanting traffic passed through for smtp, pop3,imap etc from vpn server.

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http://serverfault.com – I have a home broadband network which I also run an email server. As my provider won't give me a fixed ip address, and most servers refuse to accept smtp mail from dynamic ip ranges, I felt the simple solution we'd be to run a VPN between a virtual server I already have and my email box. I've done that fine, I installed openvpn and that connection is fine. My home network runs on 192.168.1.x,the vpn runs on 10.8.0.x with the client (my mail server) having the address on its end of the tunnel. The vps has a real world ip address on the Internet side. I ip forwarding enabled and (HowTos)