[exim] Ratelimit Messages

I have this to rate limit messages:

warn ratelimit = 100 / 1h / per_rcpt / strict
        delay = 10s
        log_message = Sender $sender_address rate $sender_rate /
$sender_rate_period excedes limit delayed 10 seconds

Problem is when a user is using Squirrelmail there IP is always listed
as 127.0.0.1. I do not think there is any good solution to that
really though. Is there a way to have one rule thats for users that
are NOT 127.0.0.1 and another for users that are 127.0.0.1? If so how
do you do that?

Thanks.

Matt