1. DNS/spf/amazon.co.jp
amazon.co.jp. 86400 IN NS ns1.p31.dynect.net. amazon.co.jp. 86400 IN NS pdns1.ultradns.net. amazon.co.jp. 86400 IN NS ns2.p31.dynect.net. amazon.co.jp. 86400 IN NS pdns6.ultradns.co.uk. amazon.co.jp. 900 IN TXT "spf2.0/pra include:amazon.com include:spf-bma.mpme.jp include:amazonses.com -all" amazon.co.jp. 900 IN TXT "v=spf1 include:amazon.com include:spf-bma.mpme.jp include:amazonses.com -all"
https://twitter.com/eno8s/status/1009720201389019136?s=20
amazon.co.jp. 3600 IN TXT "v=spf1 include:amazon.com include:spf-bma.mpme.jp include:amazon-spf.mrs.mpub.ne.jp -all"
jprs.co.jp. 86400 IN TXT "v=spf1 ip4:202.11.17.32/27 ip4:202.11.16.144/28 ip4:117.104.133.128/28 ip6:2001:218:3001:17::/64 ip6:2001:df0:8:17::/64 include:spf.tricorn.net ?all"
_dmarc.jprs.co.jp はない。
1.1. DMARC
https://dmarc.org/press/release-20140218/
1.2. テスト
% spfquery -i 153.126.187.246 -sen @amazon.co.jp amazon.co.jp fail SPF fail - not authorized spfquery: domain of amazon.co.jp does not designate 153.126.187.246 as permitted sender Received-SPF: Fail (spfquery: domain of amazon.co.jp does not designate 153.126.187.246 as permitted sender) client-ip=153.126.187.246; envelope-from="@amazon.co.jp"; receiver=spfquery; mechanism=-all; identity=mailfrom