Hi,In case of AEM 6.4 the default path for template used is /libs/settings/workflow/notification/email/tasks/created/en.txt [1].You can make necessary modifications in the templates being used for sending emails, check below link for details around it if this supports your use case.https://helpx.ado...

Are you looking something with respective to Asset Expiration as otherwise you would need a custom workflow setup as per your need.Please refer [1] in case Asset Expiration help your case.[1]: Digital Rights Management in Assets