arno,
You are getting me confused.
In your first post you said, "i have my own domain on the net, the webby is located somewere else" which implies that your web site is NOT hosted on your SME machine.
In you last post you said, "a Linux sme 6.0 svr, running as websvr and (when its working) mail server" which implies that your web server is IS hosted on your SME machine.
You cannot have it both ways using the same domain name. So which is it really?
The DNS service I mentioned has nothing to do with your SME machine but is the DNS service provider that is assigned to publish DNS information for your domain name.
DNS: Publication of DNS Address Records - The publication of DNS address information allows other DNS servers to look up your domain information. Your ISP or DNS service provider must publish DNS address records associating the name of your web server ("
www.domain.xxx"), FTP server ("ftp.domain.xxx") and e-mail server ("mail.domain.xxx") with the IP address of your server.
DNS: Publication of DNS Mail (MX) Records - The publication of DNS mail (MX) records is the method used to inform Domain Name Services worldwide that all e-mail to your domain ("yourdomain.xxx") should be delivered to your e-mail server ("mail.yourdomain.xxx").
If you do not know or understand what I am talking about then you need to ask whoever you purchased your domain name from to tell you who is providing DNS service for your domain name.
You also need to find out from your Cable provider if you have a fixed or dynamic IP address.
Once you have answers to these questions go read the SME Manual
http://no.longer.valid/phpwiki/index.php/SME%20Server%20User%20Manual particularly Chapter 3.
After you get a little understanding of the very basics and can accurately describe your network set-up and DNS records, come back here and someone will be able to give you some real help.