Technically it's an invalid MX record because MX records must point to a
hostname, not an IP address.
They are probably trying (but failing) to implement a null MX record:
https://www.rfc-editor.org/rfc/rfc7505
Peter
On 12/06/23 19:50, wesley--- via Postfix-users wrote:
Note there is also RFC 7505 "Null MX" where you simply add "IN MX 0 ." to
any DNS name you wish not to send or accept e-mail. (this is designed to
work around implicie MX records when A record is present).
I saw some domains have MX pointing to 127.0.0.1. what does this mean?
Thanks.
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