So I set the app to start in a particular mailbox, and 'back' to exit the app (as you suggested), but that still leaves me with a problem of one extra click to determine whether other accounts have new mail and to access the mail.
I understand that many users may have 5-10 accounts. But I would argue that a large number of users have 2-4 accounts, in which case the approach that I'm suggesting is more usable and intuitive. A possible implementation might be:
Accounts in navigation drawer
Displays accounts directly in the navigation drawer instead of within a subfolder
If enabled, then _inactive_ accounts should be displayed in navigation drawer e.g. if the currently active account is Account 1, then the navigation drawer would appear below the header bar for account 1 as shown below:
-------------------------------------
- Inbox (Account 1) xx
-------------------------------------
Account 2 yy
Account 3 zz
-----------------
Inbox xx
[Drafts]
[Sent]
[Deleted]
Other folders...
I hope that the developers would consider this.
Thanks.
-Rusty