If one wants to extend that solution, there could be predefined tags like out of office or custom text like same request as earlier by John Doe that can display the reason for the hiding process:
While not perfect, but you could add a email filter, to either flag the OOO responses, or filter them, and reclose the ticket. To do so filter for the header Auto-Submitted with values: auto-generated or auto-replied. for example;
Thanks for your feedback and the workaround! I will think of this.
Sometimes an out of office notice may contain important informations for the ticket owner. I would prefer to hide after evaluating if that message is of any value. Also closing a previously not closed ticket would not be intended.