Mandrill utilizes a next generation email technology platform that also supports MailChimp Embed. The sending path is designed to maximize delivery speed. All emails will be sent in 10 seconds or less from the original dispatch to Mandrill.
The Mandrill API supports message tagging so subscribers can track open and click performance over time as well as bounces. Mandrill also supports a standard SMTP interface for sending messages. Tags for tracking messages sent via SMTP can be included in the message header.