Commercial vs. Transactional Emails: 5 Powerful Ways to Optimize Your Message - Litmus
Briefly

Transactional emails relate to exchanges of goods/services like receipts or confirmations and must not contain promotions, ensuring opt-out options. They are strictly for transaction facilitation, not promotions.
Commercial emails differ as they promote products/services. Understanding the distinctions between transactional and commercial emails is vital to ensure compliance with regulations and cultivate effective customer communication.
Read at Litmus
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