Now, you can set up Adafruit IO to send you an email when the door is opened.
Click on the Select Action Feed dropdown and select the feed for the reed switch. It will be slightly indented and should be directly under the name of your device.
Next to Is, select equal to.
In the comparison value text box, put 1.
Next to Then, select email me (IO+ only).
In the final box, select the name of your component, and press create.
Now, when you open the door, you should get an email within a second or two like the one in this screenshot.