I just had to reinstall my device OS and I decided not to use a previous backup so I can finally be rid of the IT policy forever (my contacts are backed up with Google).
My account has two email addresses and they are both going into one email inbox folder thing.
That general messages folder just does that. For ever e-mail account that you add (up to 3 because that's all you can do) should have it's own icon on the Menu that you can access.