On 2017-12-20 08:21:02 +1100, Chris Angelico wrote: > If there are no MX records for a domain, either the domain doesn't > exist, or it doesn't receive mail.
This is not necessarily correct. An MTA has to fall back to A and AAAA
records if no MX record exists, so a domain can receive mail without an
MX record. This is rare, but I have seen it in the wild (although
usually not for email addresses for people but for services (e.g.
trouble ticket systems).
hp
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