Description of problem: It would be nice if milter-greylist was built with SPF enabled. Details in the README at http://hcpnet.free.fr/milter-greylist/README (section 10). It will work with libspf2 (http://libspf2.org/), libspf_alt (appears to be discontinued?) or libspf (http://www.libspf.org/ - seems to be down at the mo) so I guess it would require a package for one of these to be built too (Dag Wieers has libspf for FC2&3 at http://dag.wieers.com/packages/libspf/). Version-Release number of selected component (if applicable): 2.1.12-3
There is no spf library in FC/FE which can be used with milter-greylist. Because I do not believe in positive effects of SPF and saw lots of problems while evaluating 'libspf' with milter-greylist (due to bad code qualitity in libspf), I am not going to maintain 'libspf*' myself. Therefore, I will close this bug as deferred. Please reopen it, when a stable 'libspf*' library exists in FC/FE.
Not sure if this helps, but ATrpms has libspf2 (http://atrpms.net/dist/fc6/libspf2/). I also found RPMs for libspf and libspf2 by Paul Howarth (http://www.city-fan.org/ftp/contrib/libraries/). Maybe you'd find libspf2 a little less problematic than libspf? The website (http://libspf2.org/) makes the right sort of noises about reliability, etc. This might be a dumb question, but could milter-greylist be built in such a way that it doesn't require libspf2 but will use if if it's present?
It has already (more or less untested) support for a '--with spf' build flag. Just add this manually to 'rpmbuild' or add '%_with_spf 1' to your ~/.rpmmacros. For -devel branch I will move to the %bcond_with style without the leading underscore.