#dig googlemail.com txt
googlemail.com. 300 IN TXT "v=spf1 redirect=_spf.google.com"
#dig _spf.google.com txt
_spf.google.com. 300 IN 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 ?all"