Mail servers all offer a default set of folders : Inbox, Sent, Drafts, Spam, Deleted.
Some providers also include their own folders such as Gmail's "All Mail", Yahoo's "Archive" and more.
Aqua Mail allows you to create folders (you can learn more about how to do this here), choose how to synchronize each folder, as well as configure push and notifications where the latter two are allowed by the mail server.
Commonly, there are three types of sync states:
- Do not sync - the app won't try to update this folder on normal schedule, you may still update it manually.
- Sync with "X" folder - you can select which folder you want your app to synchronize with manually. This is useful in cases where the default folder was not automatically recognized upon adding your account.
- Sync (plain folder) - this option is used for your Inbox and any custom folders which receive messages, assuming they need to be synchronized.