I just purchased Poweramp (non-playstore version) and bound it to my e-mail address. This address is registered on my phone using the built-in, stock android client (com.android.email) which has the same icon as described in the FAQ.
However, I can not register Poweramp due to this error message (freely translated from German): "This google or e-mail account (Android 3.0+) is not registered on this device."
When opening the account list, I see "Private (IMAP)" instead of "E-Mail" and clicking "Add a new account" only gives me those three choices: "Private (IMAP)", "Private (POP3)", "Exchange".
I am sure that it is the stock android e-mail client though, so what am I doing wrong?
Content of "Private (IMAP)":
Content of the "add a new account" menu:
App details of app "email":