I believe the original way of doing this was to set up a rule from gmail to your token email on this app. Would be a string of random characters @sync.orrs.de. Unfortunately, to set that up, you have to send a confirmation code from gmail... and that seem to just get lost in the fray at this moment. I've been trying to re-set mine up for a while now and I never see it get approved, nor do I ever get an email forwarded to my account to confirm.