Due to the fact that at Farbyte we use dedicated DNS servers within our infrastructure for UK cPanel hosting accounts and not cPanel's inbuilt DNS service, you may receive a message similar to this after enabling DKIM for your hosting account:
Status: Enabled Warning: cPanel is unable to verify that this server is an authoritative nameserver for “your-domain”.
To enable DKIM on your account please open a ticket with the Farbyte Support department.