To have the spam filter in Mail.app synced across machines, do the following on your (up until now) primary machine:
Quit Dropbox.
In Terminal:
mkdir -p ~/Documents/Dropbox/Library/Setup/Mail/ ln -nfs ~/Library/Mail/LSMMap2 ~/Documents/Dropbox/Library/Setup/Mail/
Start Dropbox.
On other machines:
Quit Dropbox. (Assuming it is in sync.)
mv ~/Documents/Dropbox/Library/Setup/Mail/LSMMap2 ~/Library/Mail/ ln -nfs ~/Library/Mail/LSMMap2 ~/Documents/Dropbox/Library/Setup/Mail/
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