SMTP for user->app notification

[cstansbury]

I'm the developer of a web-based application and am looking into what it  
would take for me to be able to provide each of my users with their own  
application-specific email address so that they could send email to my site  
that would then reformat the message into something more appropriate (much  
like Posterous allows you to add blog entries via email).

Is this a "use case" that is common for James, and if not, how easy is it  
to hook into the framework system so that I don't have to poll a database  
constantly (but can instead receive email "events" and react accordingly)?

Thanks in advance, Chad