Patrick, I'm not sure I understand your question.  I believe what you 
want is a domain name provider to offer dynamic DNS.  If you're not 
sure what this is, look it up on a registration site.  I use 
http://www.easydns.com  They're Canadian, but they do a good job, 
offer https, and dynamic DNS amongst other things.  There are 
probably cheaper though--depends on what you want.
About the web site and email server, you'll need to have those port 
forwarded on your firewall configuration.  I believe some of the 
better FW people can take it from here.
Mario
>What the missing link?  With a registered domain name a static IP.  What's
>the missing think to have the DNS refer to my IP?  Setting up a web site and
>email server inside my firewall.
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