I installed it like this, is it okay?
sistemas@noroil-s02:~$ npm install nodemailer
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WARN engine nodemailer@6.1.0: wanted: {"node":">=6.0.0"} (current: {"node":"4.2.6","npm":"3.5.2"})
WARN engine nodemailer@6.1.0: wanted: {"node":">=6.0.0"} (current: {"node":"4.2./home/sistemas
└── nodemailer@6.1.0
npm WARN enoent ENOENT: no such file or directory, open '/home/sistemas/package.json'
npm WARN sistemas No description
npm WARN sistemas No repository field.
npm WARN sistemas No README data
npm WARN sistemas No license field.