This feature is now publicly available. You can receive a message in your Gmail, Yahoo, or other regular email account when a CM is sent to you. You can also set the alert to go to your phone as a text message, using the email to text address (email@example.com, firstname.lastname@example.org, or similar depending on your provider.)
To enable SMTP notification, look up this key in CM:
SMTP Notification Agent <email@example.com> 1a7c151cd52dff3cbcc849b242eec0d5505f4090
Send a message to the agent with:
as the only thing in the body. You will get an automatic reply within five minutes. To turn off notification, send a message with:
as the only thing in the body.