I thought I would share this with everyone.
I have tested this service and it seems to work really well.
I used to be on Mandrill and as you may have hear it is no longer free.
So i have searched around and found http://www.sparkpost.com
They will give you free 100,000 transactional emails per month from your OSClass. Good alternative if you do not have or want to use your own SMTP server.
You will need access to your DNS record for your domain name as you will need to make some DNS entries to validate. But the instructions are there.
Hope this helps. It works great on my OSClass 3.6.1