Use Cases and Deployment Scope
We use Amazon Simple Email Service (SES) for sending email related to information, notification, workflow approval, one time password from our self created applications and systems. These emails are rolled out to customers as well as internal teams. As we're on AWS so it is the best suited service for us to use for all these scenarios.
Alternatives Considered
Twilio SendGrid, Mailchimp Transactional Email (Mandrill) and Brevo