Create an automatic reply
Click File > Automatic Replies > Send Automatic Replies.
Add and format your message.
Optionally, click Only send during this time range, and then pick start and end dates.
For people outside your org
Click the Outside My Organizationtab, and then click Auto-reply to people outside my organization.
Add and format the message for this group.
Create an automatic reply rule
Click Rules and then click Add Rule.
Pick the options you want in the Edit Ruledialog box, and then click OK to close all the open boxes.
Turn off automatic replies
Click File > Turn Off.