Well,

I would guess that if you have an e-mail account that is accessed from different places/providers and never actually sends any mail it would tend to stand out, particularly if it was growing in size (due to the saved drafts).

If you were going to get it to work you would have to create innocuous "normal" traffic to avoid appearing abnormal. I would probably go to shopping and software providers sites and check the boxes to get e-mail notifications.