In April 2012 Mailchimp introduced a new transactional email service called Mandrill. Mandrill is using the same optimized delivery engine that Mailchimp uses for the delivery of bulk newsletters – slightly modified for one-to-one email. The core features of Mandrill are:
Uses Mailchimp's awesome email delivery engine
Tracks opens and clicks
Automatically adds Google Analytics tracking data to the URLs in the mail
Has pretty, visual reports of the email results
Allows you to tag the emails and see your stats filtered by tag
Since the above description might not help you much, let us try with an example.
Let us imagine that after registering on website X, we don't get the confirmation mail. What do we do? We contact the website owner and say - sorry, but we didn't receive the email. Let us imagine that we are the owner of website X - what do we do when a customer is telling us that he didn't receive the mail? We scratch our head and we say - look at your spam folder. But is the email really in the spam folder, was it actually sent? Is it still in the process of delivery or did it magically disappear from the face of the internet? In the past we did not have a simple way to know that, but now that has changed thanks to Mandrill. You can look at the emails being sent from your Joomla website, you can look at open/click rates and you can always know if a mail was delivered or it bounced back. This is what the Mandrill service is all about - giving you the peace of mind that your customers are receiving your emails & the bonus of knowing if they actually open them and engage with the content.