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If you feel that you need more control over your messaging than is offered by an Escalation, then instead of an Escalation, configure an Exception on your task that flows into a Send E-mail node.
This will, of course, kill the original Task (and then replace with a new one) which may not be the outcome you want. So if you want the Task to still be Active, but want (as Robert proposes) to send a fully configurable email you can use the 'Send Message Event' option in your escalation, and add a Receive Message "listener" in the same process model: