> Correct, the ABNF doesn't allow this construction, so it's a syntax error.
DMARCbis ABNF is not as restrictive as RFC 7489 : dmarc-record = dmarc-version *(dmarc-sep dmarc-tag) [dmarc-sep] *WSP > If you want more than just the ABNF to defend that position, have a look at > the DKIM RFC, from which this syntax was cloned; it says: Then wouldn't it make sense to add this specification to DMARC-bis? Olivier De: "Murray S. Kucherawy" <superu...@gmail.com> À: "dmarc" <dmarc@ietf.org> Envoyé: Lundi 24 Juillet 2023 17:57:43 Objet: Re: [dmarc-ietf] What happens when the DMARC record contains two identical tags? On Mon, Jul 24, 2023 at 8:37 AM Mark Alley <mark.alley= [ mailto:40tekmarc....@dmarc.ietf.org | 40tekmarc....@dmarc.ietf.org ] > wrote: >From my understanding, that would most likely result in a permerror code for >evaluation, given that's not syntactically valid per the ABNF for the >dmarc-record, see below where it only shows each tag once from [ >https://datatracker.ietf.org/doc/html/rfc7489#section-6.4 | section 6.4 ] in 7489. In DMARCbis, I don't see this particular table in [ https://datatracker.ietf.org/doc/html/draft-ietf-dmarc-dmarcbis-28#section-5.4 | section 5.4 ] , but given the tags are all mentioned explicitly once in both ABNFs, it would imply they're expected only once in the record, otherwise, permerror; But I'll defer to the authors if that's correct. Correct, the ABNF doesn't allow this construction, so it's a syntax error. If you want more than just the ABNF to defend that position, have a look at the DKIM RFC, from which this syntax was cloned; it says: Tags with duplicate names MUST NOT occur within a single tag-list; if a tag name does occur more than once, the entire tag-list is invalid. -MSK _______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
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