Burrow email alert not working

I have setup burrow in an EKS container. I have setup SES for smtp and registered email addresses in SES. The variables in the template are being replaced fine. The service runs fine . However the email notification isn't working. I am using the below section in burrow.toml. The templates are the same as in the source. I have not changed that. I have also tried with [emailnotifier "xx*xy.com"] + [smtp] sections in the config but did not get it working:

`[notifier.myplace]
class-name="email"
interval=60
threshold=1
send-close=true
template-open="/etc/burrow/default-email.tmpl"
template-close="/etc/burrow/default-email.tmpl"
server="$smtp_server"
port=25
from="$from_email_address"
to="$to_email_address"
auth-type="plain"
username="$smtp_username"
password="$smtp_password"
noverify=true

[notifier.myplace."headers"]
Content-Type="application/json"`

Start by reproducing the email notifier using the provided burrow.toml section in the EKS environment, with the SES SMTP settings and default email templates. Trace the notifier configuration and SMTP delivery path to identify why no notification is sent; done means an alert email is delivered successfully with the configured template and headers.