What is the trick to get SMTP to work on AWS SES?

My code:
$email = \Config\Services::email();
$email->protocol = 'smtp';
$email->SMTPCrypto = 'tsl';
$email->SMTPHost = 'email-smtp.us-west-2.amazonaws.com';
$email->SMTPUser = 'xxxx';
$email->SMTPPass = xxxx';
$email->SMTPPort = 587;
$email->newline  = "\r\n";
$email->setFrom('[email protected]', 'Company Name');
$email->setTo('[email protected]');
$email->setSubject('Email Test');
$email->setMessage('Testing the email class.');
$email->send(false);
echo $email->printDebugger();

The response:
Unable to send email using SMTP. Your server might not be configured to send mail using this method.

The email address I am sending from exists on the server, which is setup through Plesk.