樓主想幹什麼$ host -t MX gmail.com
gmail.com MX 10 alt1.gmail-smtp-in.l.google.com
gmail.com MX 20 alt2.gmail-smtp-in.l.google.com
gmail.com MX 5 gmail-smtp-in.l.google.com
gmail.com MX 30 alt3.gmail-smtp-in.l.google.com
gmail.com MX 40 alt4.gmail-smtp-in.l.google.com
$ host alt1.gmail-smtp-in.l.google.com
alt1.gmail-smtp-in.l.google.com A 209.85.225.27
$ host -t PTR 209.85.225.27
Name: iy-in-f27.1e100.net
Address: 209.85.225.27
_spf.google.com TXT "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all"
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