I understand your viewpoint, but the most important part is: mails should reach
everybody as soon as possible. Currently few of them are never reaching us :)
There does appear to be some tech issues with this list too, I was being blocked from posting to the list and after some investigation our IT department responded with:
"Their DNS servers not configured with MX records properly for us to deliver emails to them."
Now, this could quite easily be just a difference in configuration and not very good wording from our IT guys, or there could be a real problem.
We have hard coded DNS entries so hopefully this reply will hit the list. ;-)
Figured it was worth pointing out as some of the issues may not be just to do with whitelisting.
Mark