Fetchmail is a free, full-featured, robust, and well-documented remote mail
retrieval and forwarding utility intended to be used over on-demand TCP/IP
links (such as SLIP or PPP connections).

It retrieves mail from remote mail servers and forwards it to your local
(client) machine's delivery system, so it can then be read by normal
mail user agents such as Mutt, Elm, Pine, (X)Emacs/Gnus or Mailx.

It comes with an interactive GUI configurator suitable for end-users.

Fetchmail supports every remote-mail protocol currently in use on the
Internet (POP2, POP3, RPOP, APOP, KPOP, all IMAPs, ESMTP ETRN) for
retrieval. Then Fetchmail forwards the mail through SMTP, so you can
read it through your normal mail client.