Do,

The database and the mailserver are two seperate technologies. You need to retrieve the mail from the server and then write it to the database yourself. Similarily, when sending mail you will need to write a copy to the database as well as forwarding it to the mail server. If you wanted the mail server to do this directly then you'd either have to buy a server that didn't store the mail in a proprietary format or write one yourself. Alternatively, look for a mail server that allows you to expand its functionality.

Regards.