Access System Administration -> System Configuration -> Email Settings
Enter the SMTP server as one f the following:
- email-smtp.us-east-1.amazonaws.com (US East)
- email-smtp.us-west-2.amazonaws.com (US West)
- email-smtp.eu-west-1.amazonaws.com (EU)
Select the Enable TLS checkbox.
Enter the username and password obtained from Amazon.
Save the changes.
This link provides more information on Amazon SES:
https://docs.aws.amazon.com/ses/latest/DeveloperGuide/configure-email-client.html