update /etc/kong/kong.conf
smtp_mock=off
smtp_host=email-smtp.eu-west-1.amazonaws.com
smtp_port=465
smtp_username=${KONG_SMTP_USER}
smtp_password=${KONG_SMTP_PASSWORD}
smtp_ssl=on
smtp_domain=example.com
smtp_admin_emails=team1@example.com
admin_emails_from =Team1 <team1@example.com>
portal_invite_email=Team1 <team1@example.com>
portal_access_request_email=Team1 <team1@example.com>
portal_approved_email=on
portal_emails_from=Team1 <team1@example.com>
portal_emails_reply_to=Team1 <team1@example.com>
Note : team1@example.com should verified in AWS and It’s should be below format
Team1 <team1@example.com>