I tend to agree, it would have been alot easier if they left it in the network control panel where it always was.
I use Mailsmith in conjunction with Spamsieve.. the problem is, I deleted Apple's Mail client, so now I have no way to adjust the settings apparently.
A suprisingly lame move, for Apple.
I found the setting in Safari so I could change that, but it does seem rather Microsoft'ish that you have to run Apple's product in order to change to a different one.