On Fri, Jan 31, 2025 at 12:41:58AM +0000, Matt Palmer via mailop wrote:
> On Thu, Jan 30, 2025 at 02:03:51PM +0100, Matus UHLAR - fantomas via mailop
> wrote:
> > Nowadays, we can mark domains that don't send mail using Null MX (rfc 7505).
>
> The title of RFC7505 is "A "Null MX" No Service Resource Record for
> Domains That ***Accept No Mail***" (emphasis added). Assuming that a
> domain that contains a null MX record will not send mail seems doomed to
> false positives.
>
> Domains that do not *send* mail can indicate that with an all-deny SPF
> record.
I'm afraid that sending email from a NullMX domain that does not accept
any bounces, replies, postmaster queries, ... is a lost cause. Plenty
of systems will reject attemtps to send mail from such a domain, mine
included, and I, for one, have not intention of changing that.
--
Viktor.
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