The sa-exim part of this does not only affect squeeze. Both wheezy (3.3.2-5+deb7u1) and backports (3.4.0-2~bpo70+1) produce the
"Couldn't get Connecting IP header X-SA-Exim-Connect-IP for message <1410186651@lint_rules>, skipping greylisting call" messages. I have filed 760860 against sa-exim, with a patch, to try and get this solved
