Still can't get fetchmail to run as user "mail"

[Mark Devin <mdevin@ozemail.com.au>]

OK I tried making my /etc/ppp/ip-up.d/fetchmail-up script as follows:
#!/bin/sh
su - -c '/usr/bin/fetchmail --fetchmailrc /etc/ppp/.fetchmailrc --idfile
/etc/ppp/.fetchids' mail

Here is the error I get when trying to run this script as user root:
# ./fetchmail-up
fetchmail: couldn't time-check the run-control file
fetchmail: lstat: /etc/ppp/.fetchmailrc: Permission denied

Here is the listing of the .fetchids and .fetchmailrc files
-rw-------    1 mail     mail            1 Mar 27 01:08
/etc/ppp/.fetchids
-rw-------    1 mail     mail          560 Mar 27 00:23
/etc/ppp/.fetchmailrc

Is there some problem with what I have done?

Regards.

Mark.