Mandrill is an EaaS (Email as a Service) platform from the folks at Mailchimp.
The sign-up process is pretty straightforward but you might get a bit confused when configuring your sending domain SPF and DKIM records.
Mandrill helpfully provides the entire TXT record strings, but you may be wondering how exactly to add those to your Namecheap host records (as of right now they offer help for a few popular DNS and hosting services, but not Namecheap).
Below is a screenshot of my DNS settings in Namecheap that provide valid Mandrill DKIM and SPF records
