Hi 803229462ks,
I realise you posted this a while ago and hoping you’ve already found the answer you needed, but just in case and for other members who might have the same query.
the server address mx.bt.lon5.cpcloud.co.uk is for @btinternet.com email addresses which are for home/residential accounts.
To get more support for these accounts there helpdesk details are here
Don’t forget, you can get support for many BT Business products and services from our Help pages.
Regards
Markp
