/usr/lib/gnumail.app/libGNUMail.so is in gnumail.app 1.2.0~pre3+snap20071004-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gnumail.app/../GNUstep/Frameworks/GNUMail.framework/Versions/Current/libGNUMail.so