Delivery to the following recipient failed permanently: nzakas@yahoo-inc.com

[kaihendry]

$ npm view csslint | grep maintain
maintainers: 'nzakas nzakas@yahoo-inc.com',

Or make it clearer how to report bugs please.

[nzakas]

You shouldn't send bugs directly to the maintainer, that's what the URL field is for.

[kaihendry]

You shouldn't advertise a wrong email address.