Many email programs will allow you to set up an autoresponse message, usually under a heading such as Away Message, Out of Office Reply, or Vacation Responder. It can usually be found in the settings menu, and will allow you to specify a time and date range, during which the message will be sent in response to any incoming email. In some cases, your email program may keep track of who has already received the autoresponse message, so if someone emails you multiple times while you’re away, they will only receive it once.