Is qpopper secure?

[Eduardo M. A. M. Mendes]

Hello
    I was wondering if someone could help me to understand a bit more of
pop servers., specially
qppoper which I have been using for quite a while.
    For instance, when I configure netscape to read my emails on my
qpopper server (outside my ISP domain) do I have any kind of security? I
mean, am I sending a plain text password to the server? Or does qopper
have any sort of encryption mechanism?

    Thanks a lot.

Ed