any email experts out there?
 

I'm going to be running some hosted applications that will give the users email access but I don't want them destroying my server's reputation by spamming? How do I make sure this doesn't happen? Any way I can export the email portion of the app to another server or have it get sent out from another server?

you can install sendmail on a different server and only allow relay access from your application server

or you could get a totally different IP on the same box and just bind sendmail to that