This is a really cool concept. The mailbox at its base is just a specific type of data store.
I haven't looked at the code. How are you dealing with projects scattered across different environments, are you routing those notifications yourself back to a central imap store, or do you have several different stores?
An idea that came to mind. Focus on makers with customers first, offering them a marketplace that intends to help them grow, by bringing designers who need them.
It's like bringing two working sides in and finding the third side to bootstrap.
I haven't looked at the code. How are you dealing with projects scattered across different environments, are you routing those notifications yourself back to a central imap store, or do you have several different stores?