[Pdns-users] About "null MX"

[De Gubellini]

Hi all,
Do you know from which version of the authoritative server "Null MX" was
supported?
This should be the RFC
https://www.rfc-editor.org/rfc/rfc7505

I am asking this because I have an old version of powerdns that I can't
upgrade in a short time.

De'
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