Click 'Add an Account' and enter a name for your Key and your SendGrid API Key.
The simple email function allows you to send 'simple emails'. The Email Body TextArea accepts HTML.
You can change the content type from HTML (text/html) to plaintext (text/plain)
SendGrid can accept highly custom email inputs. You are able to pass a Struct Variable to SendGrid with any data you want.
Sample Input Format:
{"personalizations": [{"to": [{"email": "test@example.com"}],"subject": "Sending with SendGrid is Fun"}],"from": {"email": "test@example.com"},"content": [{"type": "text/plain","value": "and easy to do anywhere, even with Python"}]}