Awesome, I've been waiting for this, because I don't believe in the "delivery" promise of big brand mail providers. Most newsletters* go to spam, no matter if they're via Mailchimp, Aweber or transactional mail providers.

Maybe the big names work better with Gmail, since Gmail has quite an aggressive spam filtering. But neither I, nor most of my customers (Germans) use Gmail, so I don't care.

Edit: *most newsletters I receive