title: Sending emails using Mailgun with NodeMailer package
body: <p>A couple of days ago I realized that Google has changed the security of gmail accounts, particularly for the possibility of sending emails from applications. After Googling around for a while I couldn't find a fix for it.
  So, I resorted to using Mailgun. I created an account and had it enabled with Business verification. However, I still can't send emails. I keep getting an error about the requested URL not being found.
  I am suspecting that since I haven't set up a domain yet, it is not picking the mailgun domain it provided by default. Could someone show me how to test sending emails using Mailgun from NodeMailer indicating the sandbox name provided by mailgun.</p>
  
  <p>thanks in advance
  José</p>