So that ISPs know where to send your email, you need to make a small change to your domain name's registration.
How you make the change depends on where your domain is currently registered and hosted.
If they do, you can provide them with a host name they can use to forward emails to your Fasthosts account. Your host name can be found within your Fasthosts control panel.
Step 1: Log into your Fasthosts control panel and visit your list of mailboxes.
Step 2: The host name for your domain will be shown at the foot of the screen.

Quick tip: Your DNS provider may also ask you which priority you would like this MX record set up with. If this is your only MX record a priority of 10 will be sufficient.
Alternatively, you can set up the relevant sub-domains with your external DNS provider. Follow our knowledge-base article IP addresses for webmail, Outlook Web Access and other Fasthosts services sub-domains.