How can I configure the IIS SMTP service to store *all* emails (regardless of domain) in the drop folder?
Solution 1:
There are probably a number of ways to do this, but I'm thinking that if you configure the SMTP server to use a smart host for delivery and plug in a bogus ip address that will keep it from being able to deliver any emails. I'm not sure if it will cause the SMTP server to move the emails to the badmail folder or not, but at the end of the day it will keep the emails from being delivered and they'll be available to you regardless of the folder they're in.