Transactional Emails are one-off emails sent to very few (typically one) recipients and are customized specifically for the recipient. Common uses for these include:

• Follow-up and reminder emails
• Forgotten Password emails
• Order Confirmations and Receipts
• Various other one-off emails

Sending transactional emails through MailChimp is against our Terms Of Service. If you need to send transactional emails, please use either Mandrill or our STS API.