I transferred a domain from 123-reg.co.uk to SS on 13.3.20. The email address for this domain is still with 123-reg.co.uk and I have tried to add the two MX records they gave me to the domain settings in the domain. They are as follows:
However, I get a warning that this is "Not a valid host name".
123-reg.co.uk insist they are correct and this is the only information I need to be able to connect the email address to the domain.
Can anyone advise on what the issue may be?