title: Sendgrid returns 202 but doesn't send email
body: <p>I'm trying to get the basic "hello world" of sendgrid working, but have so far been unsuccessful.  The response returns code 202, suggesting that it will send the email, but the email never sends out.  Does anyone know what's going on?</p>
  
  <pre><code>import sendgrid
  
  sg = sendgrid.SendGridAPIClient(apikey='**my-api-key**')
  data = {
    "personalizations": [
      {
        "to": [
          {
            "email": "me@gmail.com"
          }
        ],
        "subject": "Hello World from the SendGrid Python Library!"
      }
    ],
    "from": {
      "email": "me@gmail.com"
    },
    "content": [
      {
        "type": "text/plain",
        "value": "Hello, Email!"
      }
    ]
  }
  response = sg.client.mail.send.post(request_body=data)
  print(response.status_code)
  </code></pre>