|I'm sorry but your post does not make a lot of sense.|
If hosting exchange you find a hosting company and bring up an exchange server for your domain name.
Unclear what you mean by you don't want pop accounts. I take you only want to do imap?
Hosting company should be able to answer all your questions in regards to the hosting solution you choose.
Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's