Hoster to Astaro to Exchange and back

Hi,

I need some help and advice for the following setup:

I have a webhoster mit webspace and mail accounts. Now I want Astaro to get those mails, scan them and forward them to my exchange server. Due to the fact that I have an dial up connection, I can't set the mx record to my hostname or ip. For sending the mails, I need to send them over a smarthost and therefore I also want that the exchnage sends the message to Astaro and astaro to the smarthost.

Is this possible with Astaro, what and how do I need configure this setup?

Thanks in advice, Albeck.