Stack Overflow has a long standing bad habit of upvoting and answering good questions that belong here. ... And of trying to send questions here that don't belong or are utter crap. I gave up trying to understand this.

Even when they get upvoted and on the hot list? :) I noticed that you read that one, but didn't touch it.

@Yeats You already said something rude; I could have suspended you right then. But I was serious about trying to help you understand your DNS issue. All I got from you was hostility. Just as you did to EEAA. Again, the only abuse in this whole situation originated with you. I'm done trying to help you.

@Yeats Here I am trying to help you, and you start up attacking me again? Why am I bothering?

@Yeats Exactly what CNAME records do you have?

@Yeats Right. The domain example.com can have an MX record, and most domains do. If it has an MX record, though, it cannot have a CNAME. But some other name can have a CNAME. Just because example.com has an MX record, doesn't affect www.example.com (which is a completely different name!). And you took that quote out of context; read the rest of the sentence.

Why do you think I said CNAME and MX can coexist? I literally cannot find this anywhere.

@Yeats As I said, you have a fundamental misunderstanding. That is not only not what I said, it's not true.

@Yeats CNAME and MX cannot coexist. The same name cannot have a CNAME record and any other record.

@Yeats You don't need a subdomain. The domain example.com itself can have an MX record (and this is the usual setup).

@Yeats There's been absolutely no abuse of power here. The only abuse has been from you.

@Yeats Oh, but he did. He said: "No, your CNAME is not the reason you can't use MX records. Your www.example.com CNAME can happily co-exist with MX records for sub.example.com pointing to whatever mailservers you want." You don't appear to have acknowledged this at all.

@Yeats Do not even think about trolling me again.

@Yeats That's the sort of abusive behavior that got you into this mess in the first place. Stop it immediately. You will not get another warning.