Not sure which DNS records I need to create to achieve the following goals. Wildcards? @? CNAMEs? A records? MX? It’s not clear how I should proceed. Please assist.
What records should I create, pointing to what?
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To best determine what each should be, I think it’s best to break down what the record types are for. Each has it’s use case. You already have MX handled, so let’s talk about A records and CNAMEs:
A record - This points a name to an IP address. The name might be “domain.com” or even “sub.domain.com” but it simply points to an IP address.
CNAME record - This points to an A record, and pulls the IP from it. Let’s say that I want sub.domain.com to always use the IP address assigned to domain.com, and I want to update both records to a new IP address later by only changing one record. I would make “sub.domain.com” a CNAME for “domain.com” which means that it always pulls the A record from “domain.com” when asked.
Each has it’s use case, and which to use at each point is entirely your decision :)