Hi,
IMAP push on means: when a message reaches the server database, it is sent to AquaMail, and will appear in corresponding folder. IMAP is supposed to be a real time process.
Synchronisation means: make the changes that occurred on server side (delete, update, reply, star, read, etc.) available on device (client) side, and conversely. Sync is a scheduled process (event based and/or time based)
IMAP push will not replicate reading a message on the server, will not delete a message on the device if deleted on the server, etc.
So Push and Sync are not the same thing. The great advantage of AquaMail is to propose them separately, up to you to select one of them or both.
>> Also, is there a way I can turn IMAP Push off for when I turn my screen off?
No, and that's not a big issue. If you ask this question, that means actually that you don't need IMAP push, because you don't want that messages reach your device when the screen is off. When the screen is on, you can always sync manually (tap on the spinning wheel for that).
That is not true for me, by enabling IMAP, reading a new mail on my webmail, makes that email marked as read instantly on my aquamail account, also deleting it.
So indeed, as long as I can see, enabling IMAP and scheduled sync is a duplicate action.
First of all, you probably meant "enabling IMAP
PUSH and scheduled sync..." (As Paris Geek wrote), not just IMAP.
And while you can configure Push and Scheduled sync to be in complete duplication, the default settings provide some difference. So, if you enable Push, it is recommended to keep scheduled sync enabled as well.
In particular, one of the differences is the folders that are included in Push. By default, only Inbox is. So, the updates to Inbox are propagated quickly to your mobile device with Push enabled. However, changes in other folders (that you may have configured to sync; by default, Sent, Deleted, Drafts are configured to sync if present) will be updated only via scheduled sync.