Quoting Andreas Pettersson:
> Does anyone know of a good greylister for use within Exim ACL that
> doesn't make use of an SQL db? Or require python for that matter.
Current Exim versions support SQLite, an embedded RDBMS. If that's good
enough for you, I described my own setup in
http://plonk.de/sw/exim/greylist.txt. I'll look if it matches my current
setup, but it should be a good start, I think.