I guess that's what I'm asking. If you apply this fix, are you now vulnerable to address spoofing again? I manage two different networks (a school and a nonprofit organization), with some pretty unsophisticated users at each. In both my cases, there's probably no need to do this at all, but I'd hate to see people applying this fix and then have naive users exposed to the sort of scams that might try to take advantage of spoofed addresses again. Might not be a problem where users are more savvy to begin with; that's just not the environment I'm familiar with!

Joe