If your DNS is hosted with another provider the following DNS records need to be setup

Type: MX
Value: mxau1.nospamcloud.com
Priority: 10

Type: MX
Value: mxau2.nospamcloud.com
Priority: 20

Type: CNAME
Name: autodiscover
Value: autodiscover-redirect.ozhosting.com

Type: TXT
Value: v=spf1 redirect=my.ozhosting.com