The default email client on my phone is reported as have almost 2.5Gb of data. It's used to sync with my work Exchange account. I've reduced the number of days to sync and the number of folders to sync, with no reduction in the reported space used by the app. I do notice that the trash folder claims 999+ messages, even though I delete the contents most days from my laptop client. That folder doesn't offer sync settings, and I can't find a way to select all of the messages to delete them.
Short of clearing all data for the app and setting my account up again, is there any way to reclaim some of this space?