More than one DMARC record is functionally equivalent to having no DMARC record so this isn’t going to cause problems outside of incompetently written code.
Ken. From: mailop <mailop-boun...@mailop.org> On Behalf Of Bressier Simon via mailop Sent: Thursday 20 August 2020 13:24 To: mailop <mailop@mailop.org> Subject: [mailop] Hotmail.tld DMARC record issue Hi folks, just forwarding an email received on DMARC ML here, to see if someone from Microsoft could fix quickly: Anyone from Microsoft in the list? Our monitoring system reported last night that Hotmail changed its DMARC record and in the process a duplicate entry was created which might cause unpredictable behaviour. ; <<>> DiG 9.10.6 <<>> txt _dmarc.hotmail.com <http://dmarc.hotmail.com/> ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23075 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;_dmarc.hotmail.com <http://dmarc.hotmail.com/> . IN TXT ;; ANSWER SECTION: _dmarc.hotmail.com <http://dmarc.hotmail.com/> . 300 IN TXT "v=DMARC1; p=none; rua=mailto:d...@rua.agari.com <mailto:d...@rua.agari.com> ;ruf=mailto:d...@ruf.agari.com <mailto:d...@ruf.agari.com> ;fo=1:s:d" _dmarc.hotmail.com <http://dmarc.hotmail.com/> . 300 IN TXT "v=DMARC1; p=reject; pct=100; rua=mailto:d...@rua.agari.com <mailto:d...@rua.agari.com> ; ruf=mailto:d...@ruf.agari.com <mailto:d...@ruf.agari.com> ; fo=1" This is the case for .com and all other TLDs. As I still have my 20-year-old Hotmail account I am an interested party :) Best, Randal -- Randal Pinto Founder & COO +447703108205 <tel:+447703108205> @randalpinto <https://twitter.com/randalpinto> Red Sift is the power behind OnDMARC and OnINBOX. You can find us at 21A Noel Street, 4th Floor, London, W1F 8GR. Red Sift is a limited company registered in England and Wales. Registered number: 09240956. Registered office: Kemp House, 152 City Road, London, EC1V 2NX.
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