A little more detail: The Splunk server is hosted on an AWS EC2 instance. I want to use the AWS Simple Email Service (that is successfully being used elsewhere in my VPC) to send email. The "Mail Server Settings" in the Splunk config has been configured with the AWS SES host, port, and credentials. These settings are correct as I can send email using the email host, port, and credentials from a shell session on the instance hosting the Splunk server. So: Config and credentials seem to be correct Firewall / Security Groups do not seem to be an issue Is there any way I can further test or get better logging from Splunk itself? Thanks, Todd ... View more