A few things that must be configured before using this

1. user's credentials must be set as env variables

2. two factor authentication must be turned off

3. less secure apps option must be turned on

4.you must install node.js, vs code and postman to use this API

5.type npm install in the directory that you are cloning, and then type nodemon server (you should install nodemon as global dependency)

6. set the API to localhost:3000/send_mail

use postman to hit the API's and set this
{ "to":"receiver's mail ids",
"subject":"geny recruitments",
"matter":"Testing this API in postman, user will add `to` and `subject` from postman, and enter the matter and hit the POST request to send the mail"

}