It's all in the summary. I might add that r3 installs in /bin, which is fine. This may actually be a big problem for system as a whole, so bug is marked as major. Reproducible: Always
I noticed it is by design (#398061). Oh well, I then request that it be reviewed. Either we have to find each and every program which has /bin/mail hardcoded, add a symlink, or move that one library to /bin
sym link from /bin/mail to /usr/bin/mail added in -r5: +*mailx-8.1.2.20050715-r5 (19 Jan 2012) + + 19 Jan 2012; Eray Aslan <eras@gentoo.org> +mailx-8.1.2.20050715-r5.ebuild: + add compatibility sym link - bug #399253 +