Hi hadaso, thanks for the tips. It makes sense, but I can't get it to work..
So i have registered domain1.com with a domain registrar and pointed the nameservers to Fastmail. I don't see an option with them to set-up a nameserver for a subdomain.
I can customize the DNS within Fastmail and add NS records for the subdomain pointing again to the Fastmail nameservers. Not sure if this makes sense, though.
But then when I go to "Add Domain" and enter subdomain.domain1.com, I get a message that "This domain already belongs to a Fastmail account".
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