Milter-greylist

Hello,

Whats the difference between the "autowhite" and "timeout" options? I've 
read the greylist.conf comments along with manual pages for 
milter-greylist and greylist.conf but its still not clear to me.

Anyone care to explain?


libspf, libspf_alt or libspf2 - which one would you recommend using and why?


I'm looking to deploy milter-greylist for specific domains at multiple 
machines (with mx sync), each scanning about 50.000 messages per day so 
any performance tips or tweaks would be appriciated.

Regards, Tony