This has become my new solution for managing expense receipts. I just forward any emails to this address, and they are all ready for bookkeeping & taxes, sitting in a single dropbox folder. I also use this + Workflow App to send photos of my physical receipts from the phone.
I tried several other (paid) solutions, and this is just so much easier for my workflow.
I use IFTTT to do this with my Gmail account, but lament not being able to use Office 365 (or other accounts) in this way. This plugs the gap pretty well. The IFTTT service is automatic, and I think you could get close to automatic with this by auto-forwarding anything with attachments.
Kindness & Co