This guide is assuming that you have already setup an email account on cPanel and you have the login details on hand...
Type your Email Adress into the email box,
Type Your username into the username box,
Type Your password into the password box.
In the "Incoming Mail Server", fill in the below:
Host Name: vh-cp01.volthosting.co.uk
(old server), or vh-cp02.volthosting.co.uk
(new server),or mail.yourdomain.com
Username: YOUR EMAIL ADDRESS
Password: YOUR PASSWORD