Hi, if a domain has no mx record than a fallback to A/AAAA for the domain is possible. Is this fallback only to happen when no mx record exists for the domain or can this fallback happen when no connection to the mx defined servers is possible? I would "guess" that it only should happen if there are no mx records at all. Can someone confirm this?
https://datatracker.ietf.org/doc/html/rfc7505 Internet mail determines the address of a receiving server through the DNS, first by looking for an MX record and then by looking for an A/AAAA record as a fallback. Thanks Norbert
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