I'm not expert on npm in any way, but have you tried it in the way that was suggested earlier in this topic by dceejay?
cd ~/usr/lib/node_modules/node-red
npm uninstall --unsafe-perm node-red-node-email
I'm not expert on npm in any way, but have you tried it in the way that was suggested earlier in this topic by dceejay?
cd ~/usr/lib/node_modules/node-red
npm uninstall --unsafe-perm node-red-node-email