Here you can configure, how the users will be notified in case an assignee is absent and how the message will look like.
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Login as JIRA Administrator
Choose > Add-ons
Select Absence for JIRA > Notification Settings from the sidebar Keyboard  Keyboard shortcut 'g' + 'g' + start typing 'Notification Settings'
You are presented with a form where you can configure three options:
Comment Creation: When you enable this option a comment will be created at the issue
When you enable this option an e-mail is send to all users that are in the "Assign Issue" event in the project's notification scheme
Message: Here you can setup the message that will be add to the issue or send out as an email. You can use Jira's wiki syntax to format your message and use specific variable that will be filled with data from the absence. See the right hand column on this page for more information