I've had my own VPS a while now and I'm able to point the DNS from 123-reg to my VPS server but I've never been able to get my emails working. Here's my 123-reg DNS settings:

* A
@ A 0
mail A
mail MX 1 mail.passionize.co.uk
www A 0

Can anyone help me in the right direction of setting up my DNS settings correctly?