How do I set up an auto-reply message for while I'm away?

You can do this through Volo webmail. Once you're logged in, click Settings at the top, then click the Autoreply tab. Here you can turn on and off your auto-reply and customize the message. Please note that your message should include the From: and Subject: lines, for example:

From: foo@example.com
Subject: Re: $SUBJECT (auto-reply)

I'm currently away and will respond when I return.

--
Foo Smith