Atwix Mandrill extension provides basic OroCRM Mandrill integration. All mail will be sent using Mandrill SMTP servers.
Use "atwix/oro-mandrill" as package name for installation via OroCRM Package Manager.
Clear cache and enter Mandrill API credentials at System Configuration page to enable integration.
Clone https://github.com/Atwix/oro-mandrill.git repository to src/Atwix/Bundle/MandrillBundle