block all outgoing email except one Virtual Domain
Great job. I tried ISPConfig 3, liked it, so I subscribed.
I am now using it as the ISP in my development network.
The development network has NAT gateway with resolvable public fqdn.
The internal network uses a private address range and fictitiuos TLD.
I want to block all outgoing mail, at the ISPConfig(ed) server, except for one Mail Virtual Domain which is publicly resolvable.
How can I do this with ISPCOnfig 3 or do I need to edit the postfix configuration directly?
I have the option of doing this at the gateway, but I would prefer to do it with postfix on the ISP server.