[exim] Newbie

Hi to All!!

Please forgive me if this question has been asked many times. I have rather
frustrated myself trying to find a few documents that are clear with regards
to Exim . My problem is.
I am using the following line in my configuration file to record the info of
a sender for security reasons

condition = ${run{/usr/local/etc/exim/scripts/iplog.pl $sender_host_address
$local_part $domain}}

But I cannot seem to find a list on variables (eg. $sender_host_address
$local_part $domain) that would show me what to use to get the email address
of the person they are sending to .

I hope this make sense

Many thanks in advance

Robby