If you are going for a holiday or will be unavailable for few days or a month, you can create an auto email responder for your emails so that when people email you, they will receive an automated email with your message like I am on holiday, please email me in a few days' time.
Log into your cPanel account.
In the Mail section, click on the Autoresponder Icon.
On the Autoresponders page, click on the Add Autoresponder button.
In the Interval field, specify the number of hours you wish the autoresponder to wait between responses to the same email address.
In the Email, field enters your email address on which you want to enable autoresponder. If you want to enable auto responder on support@example.com, enter support in the email field and should you have multiple domains, select the appropriate domain from the dropdown list.