[exim] equivalent of receiver_try_verify = true on exim v4.5…

I want to activate this on exim v.4.52, but i can't find it anywhere on the
config file.
I still using the old exim 3.x version.

I was wondering you can help me here..

"equivalent of receiver_try_verify = true on exim v4.52"

pls help

--
Louie Miranda
http://www.axishift.com -- under development