Mandrill

To all the marketer who has been using MailChimp, you might want to take a look at Mandrill. This is a paid-on to MailChimp, was built by MailChimp. It's has a lot of exciting features for the marketer that always send out the email to reach the mass. There is also a similar function like Streak, tracking the open rate, when it's open, activity log and etc.

To get the overall features, you can read it here. It has some automation, you can send email from many domains, therefore, you don't have to do it one by one.