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 <[email protected] > <mailto:[email protected]>> wrote: > > In article <[email protected] > <mailto:[email protected]>>, > Ignacio García <[email protected] <mailto:[email protected]>> 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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