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I have come across companies who are hosting their mail via a provider (usually cPanel-based) and don't have MX records in their DNS at all; the provider has a
by dwd 6y ago
I have come across companies who are hosting their mail via a provider (usually cPanel-based) and don't have MX records in their DNS at all; the provider has a failover to route them to the naked domain IP.
Absolutely insane because soon as you change the naked domain IP to point elsewhere, their email stops working.
- gog 6y agoI think it is not the providers fault. This is in the spec, if MX record does not exist for a domain try to deliver to the host behind the A record of the domain (naked IP).
- jlgaddis 6y agoThis is by design. If an MX RR isn't present, the spec says MTAs are to try to deliver majl to the host that the A RR points at. If you don't want that, create the appropriate MX RR. If you don't want e-mail for a given domain, create a null record.
- dwd 6y agoThank, wasn't aware that was in the spec. Makes sense, unfortunately allows for businesses (generally SMEs) to be relying on very sketchy setups.