[exim] Turn off logging of "no IP address found for host"?

August members of the list,

After much staring at the log_selectors list, I don't see any option
in that list. Am I being silly and missing something obvious? On a
high traffic server, it generates a lot of noise in the logs (as well
as accounting for 5% of the total size).

Philip:
If such an option doesn't exist in the log_selectors, may I please
request it be added to the Wish List?

Thanks!