gkrellm mail plugin / fetchmail / exim basics

[vester <a9900876@unet.univie.ac.at>]

hi!

could anybody explain the basics of debian's local mail delivery to me?
or, to be more precise:

i want to be able to use the gkrellm mail plugin. in order to do that i
added several pop servers to fetchmail using fetchmailconf but when i run
fetchmail, nothing happens...i do not really know how the local mail
delivery works: i'm on a single pc with a cable modem (so no LAN) and i
have got exim installed (i think exim handles mail)

thanks!