Only downloading unread emails via POP

Only downloading unread emails via POP

Set up a new POP client for an email acocunt.  It only downloaded a few messages from the inbox.
It APPEARS, not exactly sure that it is only downloading messages that have not been read on the web interface.

Is that true?  How do I change it, or how to i force it to download all messages and not just the last couple days.

I checked the POP settings and it is definately set to download all emails.