Hi there everyone!
We’re new sellers on MM but long users of the site. We’ve never had an issue with the messaging insofar as, it works. But now that we are sellers, it would be awesome to be able to sort out the messages in at least two categories: my buy inquiries and inquiries on my listed stock.
Another very helpful thing would be to be able to click on an ad and see all of the inquiries related to a particular ad. I know that I can see how many inquiries were sent on the inventory page, but it sucks going back through all the messages to see who it was that inquired on a particular ad. And i only imagine it will get worse once we have a couple of years under our belt.
Also, if I’m just a noob and don’t know how to do this, maybe some explanation would be in order. 
Thanks for your help with this!