/usr/lib/GNUstep/Applications/GNUMail.app/Resources is in gnumail.app 1.2.3-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/GNUstep/Applications/GNUMail.app/../../../../share/GNUstep/GNUMail.app