The sub/domain should be protected by the DMARC record even without an MX record, I can't find anything in the RFC to say otherwise and some senders (mostly marketing, ime) use 5322.from domains with no MX records and a "Reply-to:" header with a working domain.
>Could the syntax error caused by the receiving domain may not have the txt record to authorize the reports reception? It certainly could, of course we can't check up on that without the domain. The answer will probably depend on what is actually throwing the syntax error, is it a DMARC-checking tool on the internet, a receiver's DMARC filter, or your DNS provider? It looks like your last clause (rua=) is missing the semicolon at the end, receivers will care about that to varying degrees but it might be causing the error you see, again depending on what's giving the error. My best, Zack Aab On Tue, Sep 25, 2018 at 9:37 PM T Nguyen via dmarc-discuss < dmarc-discuss@dmarc.org> wrote: > Could the syntax error caused by the receiving domain may not have the txt > record to authorize the reports reception? > > > > *From:* T Nguyen <t.nguye...@outlook.com> > *Sent:* Tuesday, September 25, 2018 9:30 PM > *To:* dmarc-discuss@dmarc.org > *Subject:* Help > > > > Appreciate any insight to the scenario below: > > > > 1. Can non-smtp ( no mx record ) domain example.com be protected by > dmarc? I inherited the below dmarc record for this example.com with > spf record as “ v=spf1 -all “. The result was a dmarc syntax error. > > > > v=DMARC1; p=reject; pct=100; rua=mailto:dmarc-repo...@not-example.com > ,mailto:repo...@example-not.com > > > > 1. If dmarc cannot be implemented then what is the best way to protect > this non-smtp domain example.com from being spoofed by mal-intention > senders that can fool naïve users? Although with spf record “ v=spf1 -all > “alone should work for dmarc record to set policy reject all email using > this non-email domain example.com > > > > Thank you in advance, > > Best, > > tn > _______________________________________________ > dmarc-discuss mailing list > dmarc-discuss@dmarc.org > http://www.dmarc.org/mailman/listinfo/dmarc-discuss > > NOTE: Participating in this list means you agree to the DMARC Note Well > terms (http://www.dmarc.org/note_well.html)
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