We understand that this is a problem. You probably don't realize (since you aren't firewalled), but if a user is firewalled, when they log on to the site, there is a
FIREWALLED right under their username in the upper right corner (where it tells you your ratio). So, we did try to address this issue and make people aware of it. It is linked (as it is in this post) to our FAQ on being firewalled and it is in red just like here.
I don't know that a mass email/PM to them would make them any wiser. Some of the firewalled peers are firewalled beyond their control (at a university, at work, etc.), so they may just get pissed at getting a PM about it. Also, I've been on sites where I get mass PMs and I, personally, dislike them.
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