This would be a great idea,
if you were to set this thing up, you could bring back the
[email protected] email addresses and instead of accessing through your server email, eg. http://mail.mydventuregame.com, you could access it directly from the site. If this works out, maybe you can implement a "send preview of game" where you can send any user of the site a game of yours that is unpublished and you can have "show chapters: Chapter 1 [Check] Chapter 2 [Unchecked] Chapter 3 [Checked] etc." You could and should also add the option of recieving and sending mail through Microsoft Outlook and Outlook Express so you can manage email from familiar folders.
Just some suggestion,
solostrike