Emails section, if enabled, shows all email messages from all sources, merged into one list. The sources are typically email applications from the phone, and if it's possible you can also get deleted emails.
Please note, that many applications (such as Gmail or default email apps) store their data online. In such cases, it is not possible to obtain the full body of the email, because it is simply not available on the phone itself and no forensic software gets access to online storages of Google etc. In these cases, only basic information about the email (sender, receiver, date, time, header and maybe a part of the body) is obtained.