Why not set the gmail account up in thunderbird and then use a whitelist. Don't give them the password to the account so they can't access it through the site and see any spam that is coming through. That should take care of it. Just be sure not to whitelist their own account, i've noticed the spam that does get through on my email accounts appears to be from me.
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I can't enter search items and find any informative help anymore, instead the first results are always organizations selling something related to all items in the search box...
Does anyone know a way to tell the Google search that I am not buying? How do you tell Google to stop returning results from people selling products? "-buy -purchase" etc doesn't seem to work.