Not sure if this has already been suggested, but it would be nice to have the possibility to set an auto-reply that indicates that the offices are closed, rather than sending the standard one. That is, when a customer sends a reply to the system, an automated response informs him that the message has been received, and that we are closed and we will look at it later (indicating the date).
Some lateral thinking
A slightly more complicated, but also more flexible solution would be to allow some kind of scripting in the messages, so that they can be dynamically generated depending on the criteria. To make a Smarty-like example:
{if $OfficeClosed}
Our offices are currently closed...
{else}
We have received your request...
{/if}

