- Log in to webmail and open Roundcube.
- Go to Settings › Autoresponders (from the webmail home screen) or Settings › Out of Office if shown in Roundcube.
- Click Add Autoresponder and write your subject and message.
- Set a start date/time and a stop date/time so the reply switches off automatically when you're back.
- Save.
Send yourself a test from another address to make sure the reply is working, and remember to check the stop date.