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> The domain has a null MX record (indicating it doesn't accept email) Not quite true, SMTP will use the A record if there is no MX.
by emmelaich 9mo ago
> The domain has a null MX record (indicating it doesn't accept email)
Not quite true, SMTP will use the A record if there is no MX.
- dpifke 9mo agoIn this case, "null MX record" means MX exists, but does not specify a valid server: $ host -t mx example.com example.com mail is handled by 0 . Senders should not fall back on the A record in this case.