You could set up message archival, and configure it to archive to a shared drive mapped to the SmarterMail server. I believe you may be able to redirect messages to an account on a domain stored on the shared drive as well potentially. 

Kyle, that might work. Do you have documentation on the message archiving?

Absolutely! Here you go:

https://help.smartertools.com/SmarterMail/current/Default.aspx?qq=%2fSmarterMail%2fcurrent%2fTopics%2fSystemAdmin%2fSettings%2fStorage%2fMessageArchiving.aspx 

Don't think this will work as I would only want it for certain email accounts and would want users to be able to read emails from within the shared network folder. I think I will end up having to use a vba script via outlook rules to accomplish. I think it would be a great feature for SmarterTools though. Have the ability through message filters to be able to route emails to a folder / shared folder.