method to send an e-mail based on a field change?

method to send an e-mail based on a field change?

Is there a method to send an e-mail based on a field change? If a ticket is already created and a user or technician changes a field, say from low to high priority, I would like the system to create a mail notification. Since the ticket already exists the SLA and Business Rules will not work as they are only applied to new incoming tickets. Any ideas?

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