Can someone confirm a query for me – we have separate sub domains set up in as separate mail domain accounts. How should we compile our DNS to facilitate this?
I will try and simplify this a little, so in our admin console we have –
Domain.com | Users - email@example.com | Groups
Sub.domain.com | Users - firstname.lastname@example.org | Groups
Sub2.domain.com | Users - email@example.com | Groups
How should we setup this up correctly in DNS? Should we setup independent DNS zone files (for domain, sub.domain, and sub2.domain) or can each MX record be stated under the domain.com zone file?