fetchmail & exim on a ppp dialup

[Paul E Condon <pecondon@quiknet.com>]

I have a newly installed Potato host. I have installed and configured fetchmail
and exim as best I understand.
Email is not coming through to the mail file /var/mail/pecondon as I think it
should. What can I do to debug?
What information is needed by people who might give me advice?

I am running only one host using ppp. I want to get exim and fetchmail running
because I hope, eventually, to
have a slightly more complicated setup involving four local hosts and two users.
And, I want to learn.

Thanks,
Paul