Log into your [client area](http://ca.myhost.ie).

On the black tool bar go to Services >> My Services >> Open Control Panel (for your hosting package)

If you have a multi webspace hosting package, click on webspaces and select the webspace for the domain you wish to set the auto-reply for.

Select the 'Mail' tab, then select the email address, then the Auto-reply tab.

There you can configure an auto-reply message for your mail account.