Pepipost - Free SMTP alternative to Mandrill

Website: Pepipost

- Free plan and send up to 25,000 emails each month. Free forever.
- No credit card required.
- DKIM is not required (Domain Verification: (a.) Meta Tag Validation, (b.) File Creation - System can verify the domain based on the presence of a file in the root directory of the domain.).
- Pay only for emails that are not opened by your customers.

* 3 Months Free Unlimited Transactional Emails + 25k emails per month free forever.
* Use the below code while signup with Pepipost.

Code:
ALT-TO-3M

Great! This is probably the best FREE alternative for Mandrill.