Quoting Marten Lehmann:
> Is there anything planned for exim that includes builtin greylisting
> support?
I don't think so. Why should anybody spend time for something that can
be done easily within Exim, probably much more flexible than an builtin
solution...
> If not, which solutions are prefered?
I prefer my own. :)
http://plonk.de/sw/exim/greylist.txt
Uses sqlite, but could be changed for any other rdbms that talks sql.
(should be updated, though, to reflect my current config)