[Exim] Exim-MySQL on FreeBSD (How?)

Hi,

I've installed the Exim-mysql port on FreeBSD
but can't find any help in the Exim FAQ's or DOC
on how to use it (ie. table layout and exim
configuration samples).

I'm hoping to move about 30,000 users to this
system - will mysql cope? is postgrSQL better?

I'd really appreciate any help.

Thanks,
Adrian.