Thanks again for your help. I do not know what the Crypto tab is?
My hosting service is Fasthosts UK.
This is what I got back from their Support when I asked about Mailserver names:
" Thank you for your recent enquiry (180810-000819).
_ What do you mean by mailserver names?_
_ What are you trying to achieve, please?_
_ Are you trying to point the MX Records to us?_
_ Fasthosts MX Records details:_
_ I await your response, thank you._ "
MX Record now shows as pointing to mailserver.domainname but emails still not being received.