Adding spam protection to exchange server

Hello, I have an Exchange server 2000. I'm trying to get Postini (spam protection) in place. My web designer is no longer returning my phone calls. I was able to track down the hosting company, I was also able to get to the registration of my domain name and make sure that I'm the owner and in fact I can access the registration information. my questions are:
1) How does Exchange work? Does my exchange server act like a mail server?( in other words is that mail server that I have in my server closet is the only place that the e-mail messages for the whole domain is stored? unlike a POP3 where e-mails are with my host. am I understanding this right? Also, how does my host know the IP address of my exchange server (if that's how it works)?

2) if the answer to my first question is yes (the only copy of my e-mails is on that exchange server that I own), then how odes that work? is that what is called MX records? if its in fact MX records, where can I change these MX records?

3) The way Postini (spam protection) works is that they want me to direct all the e-mails to them, they clean it out, and then send it to my exchange server. My question is how hard is it to make these changes (have the e-mails sent to Postini first, and then back to my Exchange server)? They said it's a simple change in my hosting control panel (to change the DNS to Postini's server) then another simple change in my Exchange server to receive from Postini instead of my current host.

4) how complicated is over all process (I have to change my hosting now because my web designer won't give me the password and the user name to my website's control panel, setting up the Exchange server setup with the new hosting company, getting all the incoming e-mails to Postini for spam removal, getting all the e-mails from Postini to my Exchange server)

Sorry about the long story, I have some knowledge of the process, but I need some clarifications on things, Thank you, I'm desperately waiting a response.
markmanfieldAsked:
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SembeeCommented:
Exchange is a mail server, so other email severs on the internet deliver to your server.
It does this via MX records in your DNS for your domain. Your MX records are changed in the domain configuration by whoever manages your domain. This could be your web host, ISP or domain name registrar.

If you use Postini then you you point your MX records at their servers instead of your server. Postini then send email to your server.
The changes are very small, take a few minutes and Postini should be able to assist with configuration of your domain and Exchange.

Simon.
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