../_spf.google.com ../dwango.co.jp

1. whois

gmail.com.              282     IN      TXT     "v=spf1 redirect=_spf.google.com"

2. history

gmail.com.              981     IN      MX      40 alt4.gmail-smtp-in.l.google.com.
gmail.com.              981     IN      MX      30 alt3.gmail-smtp-in.l.google.com.
gmail.com.              981     IN      MX      10 alt1.gmail-smtp-in.l.google.com.
gmail.com.              981     IN      MX      20 alt2.gmail-smtp-in.l.google.com.
gmail.com.              981     IN      MX      5 gmail-smtp-in.l.google.com.

gmail-smtp-in.l.google.com. 72  IN      A       74.125.23.26

aigis1000.jp
aktsk.jp
dwango.co.jp
samuraioffice.co.jp
syncpower.jp
trifa.jp
uchicrew.jp
unstreet.jp
wakaruukaru.jp

dwango.co.jp.           300     IN      TXT     "v=spf1 +ip4:103.115.217.55/32 +ip4:61.113.104.0/24 +ip4:124.146.170.8/32 +ip4:124.146.170.9/32 +ip4:203.174.79.94/32 +ip4:133.152.0.0/17 +ip4:52.197.205.21/32 +ip4:124.146.170.8/31 +ip4:54.168.106.113 +ip4:13.112.25.112 " "include:mail.zendesk.com include:spf.smktg.jp include:_spf.google.com include:spf.eco-serv.jp include:_spf.bownow.jp -all"

unstreet.jp.            300     IN      TXT     "v=spf1 include:_spf.google.com ~all"

3. gmail-smtp-in.l.google.com

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