There used to be a way to set the sync period for each folder within your email but you can't do it anymore. I have thousands of emails in my inbox and I don't want to sync all of them. However I have only a few emails in other folders that I would like to always have access to regardless of how old they are. Can't seem to find a way to do this in the stock email app.
@jgranovsky, go into the Samsung email app, then go to settings, select your email account, from there select sync period and folders to sync. You can't however select a different sync period for individual folders.
