A. If your ISP does not support ETRN, then you have to use a third party utility to retrieve the mail from a POP3 mailbox. One of these utilities is Mail essentials Small Business (http://www.gficomms.com).
The POPWeasel by Mailgate Ltd is a command line utility that will collect from multiple POP accounts and forward on to an SMTP server. For full information see http://www.mailgate.com
A more complete listing of utilities can be found on http://www.slipstick.com