Proper Way to Configure a Domain which never sends emails
Marco Davids
Marco.Davids at sidn.nl
Tue Aug 20 07:28:41 UTC 2019
A TXT _dmarc.domain.tld "v=DMARC1; p=reject" might also be useful.
--
Marco
On 19/08/2019 23:31, Kevin Darcy wrote:
> [ 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 <barmar at alum.mit.edu
> <mailto:barmar at alum.mit.edu>> wrote:
>
> In article <mailman.930.1566219505.711.bind-users at lists.isc.org
> <mailto:mailman.930.1566219505.711.bind-users at lists.isc.org>>,
> Ignacio García <yo at ignasi.com <mailto:yo at 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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