i made my computer a web and mail server, but have some problems
 

i will get by this way unlimited size on my hard disk and i can create unlimited e-mail accounts
i just do all of these on my host computer.

I buyed a domain name by a web site and also buyed a
host too for publishing. but the host agrement will be end next month. the
problem is not this :)
i made a host, and my all web pages and e-mails run on it.
it has a static ip, it is 7/24 open in internet. iis and domain settings are okay no problem. it is running well.
i want to do that my computer will answer directly for all request (for my web and mails)

2-3 months ago i made a server to publish my web sites and mails.
and then i changed host address to my static ip asddress in my web contol panel
in generaldots.com.
now the web site is running on my computer.
after that i made e-mail server on my computer too
now i want to set my static ip address for my emails too.
namely i want to use pop.xxxxx.com and smtp.xxxxx.com in
outlook settings
all things web and mail servers need play in my computer.
i need to assign my ip address in dns settings of the domain web site as CNAME or like etc.

What can i do?

Thanks Alll