If you're running a current Build of SmarterMail (i.e., a 100. Build), Content Filters can now be run manually. So, they could always run that content filter on their Junk Email folder prior to reviewing the messages in it.
Another option would be to review the spam score of false-positives, then adjust the spam scoring as necessary to try and cut down on them, or even start adding custom domains or even individual email accounts as Trusted Senders for their domain -- that will cut down on some of that as well.
Derek Curtis
COO
SmarterTools Inc.
www.smartertools.com