Do the third party mail Apps like the Outlook App or some other App store password and mail content on their own servers also. I am told that the third party apps like Outlook are not allowed background refresh by iOS. This forces them to fetch IMAP mails remotely to their own servers which in turn sends push notifications to the iPhone. This mechanism is breach of privacy/ security. The native mail App of iOS is perhaps the only App which can background refresh and fetch mails directly from mail servers to the iOS device, and send notifications for new mail received in any folder on the server configured as favorite, without storing the password on Apple servers. Someone may please correct me.