Gmail / Gmail Power User

Set an out of office reply

You can set an Out of Office Reply to be sent to anyone that emails you while you are away from the office. If the same person contacts you again while you are away, they will not receive the Out of Office reply unless 4 days have passed since their last message. If more than 4 days have passed, Gmail will send another response to remind that person that you are still away.

To set your Out of Office response:

If you have a signature set, this will be added to the end of your Out of Office message automatically. 

A banner will display at the top of the Gmail screen when your Out of Office is enabled. To disable Out of Office so that no more automatic responses are sent out, click on the End Now link on this banner.