Thanks for the suggestions Phil, I have found the answer to my nightmare! You see, I am running my E-smith-box as Server (not as gateway) and everything is connected to my hub, that is connected to a Flowpoint firewall/router, that is connected to a ADSL modem. The problem now is that when you install E-smith, the software generates the different /var/named files incorrectly. If I don't change the IP addresses of my www, mail hosts (and probably also ftp, but I am not up to that point now) to my fixed IP address that I received from my ISP, my webpages won't be published onto the internet AND I won't receive any e-mails at all!! There is something really missing at the E-smith installation here, as I see it, this can't be the idea that I have to change the IP address all the time when I install a new version of E-smith, or when I add a new virtual host??