We need to use HTML tags in alert email body, right now whatever the tag we pass, they are considered as text and displayed in the email as it is. As per below suggested solution we need to update sendemail.py file in splunk server.
https://community.splunk.com/t5/Alerting/How-to-add-HTML-markups-to-alert-email/m-p/524453
Is there any other way to achieve this? Need help on this.
I'd suggest that you don't touch the built-in sendemail.py but rather copy it as a new script and copy the alert action definition along with it. This way you won't lose your modifications after upgrade.
Secondly, if it's possible, I'd rather modify the template if you want to have some formatted header or something like that. Pasting external data (especially if it's a raw event data) to be rendered as html, possibly with included js, is not a great idea.