Email will show up in POPFile's history (http://127.0.0.1:8080/history) and in your email client (e.g. Outlook). The history page in POPFile is only for reclassifying email and any email that is there for two days (by default) or more will automatically be deleted.
Should you find anything in the documentation that is incomplete, unclear, outdated or just plain wrong, please let us know and leave a note in the Documentation Forum.