I am using Amazon SES to send emails from AbanteCart running on an Amazon Lightsail instance.
In System / Settings / Mail I have:

Mail Protocol: SMTP
SMTP Host: tls://email-smtp.us-east-1.amazonaws.com
SMTP User Name and Password as per Amazon SES
SMTP Port: 587
SMTP Timeout: 10

I get errors trying to send emails, and am not sure what I am doing wrong.

I have tried the host name with and without "tls" at the front but it doesn't make any difference.

When I try to send an email, I get errors as per the attached log

Would someone please help me resolve this?