Nope. That entirely depends on the service. Most saas I use for marketing and programming sends 95% transactional emails and 5% promotional emails. The most im

Nope. That entirely depends on the service. Most saas I use for marketing and programming sends 95% transactional emails and 5% promotional emails. The most important aspec is that a user invests his time and effort in the service and after time using the service becomes an important habit that provides productivity, entertainment or just attacks your limbic system to optimize for user pleasure. And that habit allows to monetize effeciently.