If you want POP3 Secure (port 995) then you have to download the stunnel package www.stunnel.org

Create an PEM file (described on stunnel.org) and create the below entry's in xinetd.conf or in /etc/xinitd.d/

service pop3s
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/sbin/stunnel
server_args = -T -p /etc/stunnel/stunnel.pem -l /usr/sbin/vm-pop3d -- vmpop3d -i -u 99
}

after that do a service xinetd restart and your done....port 995 is ready and users can enjoy security.

Cheers!