Comment on Microsoft mishandling example.comparentComments−dpifke7moIn 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.
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In this case, "null MX record" means MX exists, but does not specify a valid server:
Senders should not fall back on the A record in this case.