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Presentation by Shishio Tsuchiya at APRICOT 2017 on Thursday, 2 March 2017.
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DMARC and mailing list
1.
Copyright © Arista
2017. All rights reserved.Copyright © Arista 2017. All rights reserved.1 DMARC and mailing list Shishio Tsuchiya shtsuchi@arista.com
2.
Copyright © Arista
2017. All rights reserved. Who am I? • Shishio Tsuchiya - 1997-2000: Ricoh - 2000-2016: Cisco cisco.com - 2017- : Arista arista.com • Sr. Systems Engineer and contributes to community JANOG,APNIC and IETF 2
3.
Copyright © Arista
2017. All rights reserved. Arista • Network equipment vendor who are focus on data center and cloud technology • Most of develop engineer works at Santa Clara but customer engineer and sales works from home , café and so on. • We are really using cloud services(gmail,google callender,box etc). • arista.com is our domain and brand name and security is really important for us. 3
4.
Copyright © Arista
2017. All rights reserved. What is happened from 2017 4 My mail from shtsuchi@arista.com suspect as spam….L on janog.gr.jp
5.
Copyright © Arista
2017. All rights reserved. Reputation? http://www.senderbase.org/lookup/?search_string=arista.com 5 Looks Clean!!
6.
Copyright © Arista
2017. All rights reserved. DMARC “Domain-based Message Authentication, Reporting & Conformance” 6 sender Receiver checks sender information if it does not match from domain then ask sender’s org policy by DNS also reports DMARC execution result to sender. Reject Quarantine None drop Spam or Junk folder can read
7.
Copyright © Arista
2017. All rights reserved. How to check organization DMARC policy? 7 shtsuchi:/ shtsuchi$ nslookup > set type=txt > _dmarc.arista.com Server: 172.22.22.40 Address:172.22.22.40#53 Non-authoritative answer: _dmarc.arista.com text = "v=DMARC1; p=quarantine; sp=reject; pct=100; rua=mailto:mailauth- reports@arista.com; ruf=mailto:mailforen-reports@arista.com; fo=1" Authoritative answers can be found from: google.com microsoft.com yahoo.com aol.com are already p=reject cisco.com p=none at first our policy was p=none but we has changed policy after 1 year test period
8.
Copyright © Arista
2017. All rights reserved. Mailing list issue 8 arista.com Reject Quarantine None janog.gr.jp changes sender and keeps from address ask _dmarc.arista.com p=quarantine
9.
Copyright © Arista
2017. All rights reserved. Message to mailing list owner • Please consider upgrade mailing list software • https://dmarc.org/wiki/FAQ#I_operate_a_mailing_list_and_I_want_to_interop erate_with_DMARC.2C_what_should_I_do.3F • https://wiki.list.org/DEV/DMARC • IETF mailing list looks upgrade to 2.1.17 but now on discussion • NANOG mailing list is 2.1.20 now • JANOG mailing list is considering upgrade to 2.1.23+j3p3 • APOPS mailing list is 2.1.12 …. 9
10.
Copyright © Arista
2017. All rights reserved.Copyright © Arista 2016. All rights reserved. www.arista.com Thank You