Have been using this add-on for a long time, and it definitely deserves a 5 star review. I use the add-on along with Mandrill, and it's been working perfectly!
1. Get rid of any hourly limit your hosting provider has in place by default by using Mandrill or any other external mail provider, also ensure that e-mails reach without having to bother yourself about mail management.
2. Very easy to set up and configure, very helpful in handling bounced e-mails and changing user status automatically.
3. Logs are generated when e-mails cannot be delivered or there is any error, and the author has been very helpful with any and all doubts (not only to me but to all other users as well).
4. Did I say it takes away all your worries for e-mail management? Yep, you can concentrate on other things and just let this do all the job!
A must have for more control over e-mails, to ensure proper delivery by external providers - and to make it all a breeze and not worry about e-mail backend at all!