>>achyne+(OP)
Honest question: What exactly does it mean for a registrar to block a domain? I believed so far that for my browser to successfully connect to a web server running on a domain or for a mail server to deliver email to a domain, there should only be valid A, AAAA, MX, and/or CNAME records in the DNS.
Was it really a block at the registrar level or was it a block at the DNS level, i.e., the registrar also ran DNS service and their DNS service refused to return responses for zoho.com domains?
At what layer or at which stage of the protocol can a registrar disrupt this and take a domain offline?