postgrey has ebuilds in both mail-mta and mail-filter. The one in mail-filter is current; the one in mail-mta should probably be removed (along with the directory). Reproducible: Always Steps to Reproduce: 1. 2. 3.
there isn't a postgrey in mail-mta. http://www.gentoo.org/cgi-bin/viewcvs.cgi/mail-mta/
Oops, my mistake...package was moved, I'd had a /usr/local/portage entry to get it to build, didn't blow that away, portage complained, I thought it was real. Sorry about that, folks.