[exim] hosts_connection_nolog - how do I set it?

Hello,

I am trying to set the hosts_connection_nolog option.

At first I set it like this (as I do not want logging for connections from
this IP):

hosts_connection_nolog = 192.168.16.2

But it does not seem to work (connection are still logged. I then added a
colon, then domain name but even though I wound up with this:

hosts_connection_nolog = 192.168.16.2 : relay.lc-words.com

I still have connections being logged from 192.168.16.2.

What do I do wrong? Many thanks!

--
Zbigniew Szalbot