Hello Jason. This feature is already available within the user's Settings>Autoresponder where you can enable the toggle Only send between certain dates to limit what days the autoresponder applies to. This may not be available in older versions of SmarterMail, so this may be a good opportunity to upgrade. 

Kyle,

 Thank you, we have the option I just totally missed it. 

You're very welcome Jason, thats what we're here for!