How do I run a custom email from Splunk shell?

Splunk Dev

Hello,

I've built a custom email Python script to send as an alert in order to be able to add some CSS to my email.

I ran it using SMTP and it worked well once i entered the Windows CLI on my server and ran it from there.

However i tried to run it through Splunk custom command and experienced failure so i went to the Splunk shell CLI
on my server and tried to run it from there. From there, i got the following error: "SMTPServerDisconnected: Connection unexpectedly closed."

I need your help to figure out why this is happening since i've already been able to send normal emails from my Splunk.

Thanks in advance.

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How do I run a custom email from Splunk shell?

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

The Trust Gap: Why a Data Foundation is Fundamental to an Agentic Enterprise

Data Management Digest – September 2026

Federated Search for CloudWatch Unified Data Store Is Generally Available