[exim] dnslists syntax suggestion

After I looked up my mistake I figured out what I did wrong. But I have
a suggestion about dnslist syntax to make it more intuitive.

The following is correct.

dnslists = domainkarma.junkemailfilter.com=127.0.0.2/$sender_address_domain

This doesn't work.

dnslists = domainkarma.junkemailfilter.com/$sender_address_domain=127.0.0.2

The second one seems more intuitive and I wonder if it would be better
if both worked?