I agree with most of Bill Kammerer's contributions on
this forum, but disagree with this one:
> do we need any more proof that email filtering
doesn't work?

Filtering isn't a silver bullet, but it's part of the
solution.  
> ..."rely on users' training and intelligence."  
That won't work.  Taking email encryption as an
analogous example, you've probably seen the Carnegie
Mellon paper from a few years ago, "Why Johnny Can't
Encrypt."  They studied a group of fairly high-skill
users (CS researchers), and gave them the task of
sending and receiving encrypted email.  Most of them
had trouble with the software (PGP 5.1, I think), but
more importantly they consistently forgot to click on
"encrypt" when they had a confidential message to
send. 

If you're relying on users' training and intelligence
ALONE you're almost certainly not compliant.  You
don't rely on that alone.  As one user told me, "It
would be insane to install a bunch of keyword
triggers, sit back and assume you're compliant."  It
would also be insane to base your compliance on users
remembering to do the right thing.

Email filtering is similar to IDS.  You have to buy a
good commercial package, spend a lot of time tuning it
for your organization, install update almost daily,
and put in a lot of maintenance by a live sysadmin. 
Nobody said it was cheap, and the false positives
certainly are annoying, but it's necessary, in my
view.

By the way, I've seen a lot of unanswered requests for
lists of PHI keywords.  I don't think anybody has a
list they are happy with.  Anybody who has, please
chime in.

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