You can fire a custom event in a listener if the filed changes - see https://jamieechlin.atlassian.net/wiki/display/GRV/Built-in%20Scripts#Built-InScripts-Firesaneventwhenconditionistrue
You then hook that event to a velocity template if you want to use velocity.
If you don't want to use velocity you can write your own email template: https://jamieechlin.atlassian.net/wiki/display/GRV/Built-in%20Scripts#Built-InScripts-Sendacustomemail
Other methods from other plugins are probably available.
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