/usr/lib/GNUstep/ApplicationSupport/ is in gnumail.app 1.2.3-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/GNUstep/ApplicationSupport/GNUMail/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Account.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Account.prefs/Account
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Account.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Account.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Advanced.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Advanced.prefs/Advanced
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Advanced.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Advanced.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Colors.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Colors.prefs/Colors
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Colors.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Colors.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Compose.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Compose.prefs/Compose
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Compose.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Compose.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Emoticon.bundle/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Emoticon.bundle/Emoticon
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Emoticon.bundle/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Emoticon.bundle/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Filtering.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Filtering.prefs/Filtering
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Filtering.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Filtering.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Fonts.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Fonts.prefs/Fonts
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Fonts.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Fonts.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Import.bundle/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Import.bundle/Import
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Import.bundle/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Import.bundle/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/MIME.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/MIME.prefs/MIME
/usr/lib/GNUstep/ApplicationSupport/GNUMail/MIME.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/MIME.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/PGP.bundle/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/PGP.bundle/PGP
/usr/lib/GNUstep/ApplicationSupport/GNUMail/PGP.bundle/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/PGP.bundle/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Receiving.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Receiving.prefs/Receiving
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Receiving.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Receiving.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Sending.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Sending.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Sending.prefs/Sending
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Sending.prefs/stamp.make
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Viewing.prefs/
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Viewing.prefs/Resources
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Viewing.prefs/Viewing
/usr/lib/GNUstep/ApplicationSupport/GNUMail/Viewing.prefs/stamp.make