[ Classification Level: PUBLIC ]
MXes are for *receiving* mail of course. The request is about *sending*
mail.
Setting the SPF record to "-all" is probably about the best you can do,
since AFAIK there is no universally-recognized way to signal "domain X
never sends mail".
Ironically, in order to prevent anyone from accepting mail purportedly from
your domain, you might want to make yourself look as much as possible like
SPAM or malware.
Perhaps you could volunteer your domain to be added to one or more of the
public SMTP blacklists? :-)
- Kevin
On Mon, Aug 19, 2019 at 10:34 AM Barry Margolin <bar...@alum.mit.edu> wrote:
> In article <mailman.930.1566219505.711.bind-us...@lists.isc.org>,
> Ignacio García <y...@ignasi.com> wrote:
>
> > Hi there.
> >
> > Thanks for your support. First message to the list, sorry if already
> > posted a similar question, but I haven't found mention anywhere.
> >
> > I have to set up dns records for a domain just for a web site, for which
> > we will NEVER send emails (though we might receive some from old
> > customers), so I would like to announce somehow that emails sent from
> > this domain should always be disregarded. I was thinking of setting just
> > A and AAAA records for @ and www, NS records, MA records (for receiving)
> > and SPF with a record just consisting of v=spf1 -all , not declaring an
> > A and MX records at all. I'm not sure at all this is a proper way of
> > declaring this. In fact, what I would like is to EXPLICITELY mention
> > somehow that we will never send emails from that domain. Could anybody
> > help me with this?
>
> A common practice is to point the MX record to ".".
>
> --
> Barry Margolin
> Arlington, MA
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