Your account comes with email autoresponders which can be set to give a reply to each email received, or only to certain emails. You may wish to use this to acknowledge receipt of email, or to give a holiday reply.
To set up an autoresponder:
1) Log in to the control panel for your domain.
2) Click on the Auto Responders icon.
4) Choose Add Auto Responder to create a new one, or Edit to edit an existing one.
5) Enter the interval between auto-responses. This should generally be at least 24 hours
6) Enter the email address the responder is for.
7) In the From field, enter your name as you would like it to be seen by the recipient.
8) For the Subject, you can enter a specific subject or can use "Re: %subject%" to retain the original subject.
9) In Body, enter your email response.
10) Optionally, set the start and finish dates for the autoresponder to turn on or off
Click Create/Modify to finish
PLEASE NOTE: Autoresponders normally send out a reply each time an email is sent to them unless set otherwise. Best practrice is to respond to emails from a given sender at most once per day. This is important, because if you have a holiday reply send out a response for every email, you will probably be removed from any mailing lists that the address is subscribed to and may be considered to be a spammer. And if you receive a bounce notice, you can start an endless loop of replies back and forth!
Have it reply at most once per day instead.