Business Rules - Prevent Repeat Triggers

Business Rules - Prevent Repeat Triggers

Is there any way we can setup a business rule so it only triggers once, rather than on every edit.

Scenario:
We've got a field on our templates for Escalation (Yes/No).

On the request when escalation is set to YES an email is sent to various managers, but that email is sent on every subsequent edit of the request.
What we need is the email to trigger only once.

We're using....
Your Version 9.4 Build 9411

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